diff --git a/lib/src/telegram/model.g.dart b/lib/src/telegram/model.g.dart
index f29105e..3b2937d 100644
--- a/lib/src/telegram/model.g.dart
+++ b/lib/src/telegram/model.g.dart
@@ -12,9 +12,9 @@ Animation _$AnimationFromJson(Map<String, dynamic> json) => Animation(
       width: json['width'] as int,
       height: json['height'] as int,
       duration: json['duration'] as int,
-      thumb: json['thumb'] == null
+      thumbnail: json['thumbnail'] == null
           ? null
-          : PhotoSize.fromJson(json['thumb'] as Map<String, dynamic>),
+          : PhotoSize.fromJson(json['thumbnail'] as Map<String, dynamic>),
       fileName: json['file_name'] as String?,
       mimeType: json['mime_type'] as String?,
       fileSize: json['file_size'] as int?,
@@ -35,7 +35,7 @@ Map<String, dynamic> _$AnimationToJson(Animation instance) {
     }
   }
 
-  writeNotNull('thumb', instance.thumb?.toJson());
+  writeNotNull('thumbnail', instance.thumbnail?.toJson());
   writeNotNull('file_name', instance.fileName);
   writeNotNull('mime_type', instance.mimeType);
   writeNotNull('file_size', instance.fileSize);
@@ -51,9 +51,9 @@ Audio _$AudioFromJson(Map<String, dynamic> json) => Audio(
       fileName: json['file_name'] as String?,
       mimeType: json['mime_type'] as String?,
       fileSize: json['file_size'] as int?,
-      thumb: json['thumb'] == null
+      thumbnail: json['thumbnail'] == null
           ? null
-          : PhotoSize.fromJson(json['thumb'] as Map<String, dynamic>),
+          : PhotoSize.fromJson(json['thumbnail'] as Map<String, dynamic>),
     );
 
 Map<String, dynamic> _$AudioToJson(Audio instance) {
@@ -74,7 +74,7 @@ Map<String, dynamic> _$AudioToJson(Audio instance) {
   writeNotNull('file_name', instance.fileName);
   writeNotNull('mime_type', instance.mimeType);
   writeNotNull('file_size', instance.fileSize);
-  writeNotNull('thumb', instance.thumb?.toJson());
+  writeNotNull('thumbnail', instance.thumbnail?.toJson());
   return val;
 }
 
@@ -851,9 +851,9 @@ Map<String, dynamic> _$DiceToJson(Dice instance) => <String, dynamic>{
 Document _$DocumentFromJson(Map<String, dynamic> json) => Document(
       fileId: json['file_id'] as String,
       fileUniqueId: json['file_unique_id'] as String,
-      thumb: json['thumb'] == null
+      thumbnail: json['thumbnail'] == null
           ? null
-          : PhotoSize.fromJson(json['thumb'] as Map<String, dynamic>),
+          : PhotoSize.fromJson(json['thumbnail'] as Map<String, dynamic>),
       fileName: json['file_name'] as String?,
       mimeType: json['mime_type'] as String?,
       fileSize: json['file_size'] as int?,
@@ -871,7 +871,7 @@ Map<String, dynamic> _$DocumentToJson(Document instance) {
     }
   }
 
-  writeNotNull('thumb', instance.thumb?.toJson());
+  writeNotNull('thumbnail', instance.thumbnail?.toJson());
   writeNotNull('file_name', instance.fileName);
   writeNotNull('mime_type', instance.mimeType);
   writeNotNull('file_size', instance.fileSize);
@@ -2349,7 +2349,7 @@ InputMediaAnimation _$InputMediaAnimationFromJson(Map<String, dynamic> json) =>
     InputMediaAnimation(
       type: json['type'] as String? ?? InputMedia.typeAnimation,
       media: json['media'] as String,
-      thumb: json['thumb'],
+      thumbnail: json['thumbnail'],
       caption: json['caption'] as String?,
       parseMode: json['parse_mode'] as String?,
       captionEntities: (json['caption_entities'] as List<dynamic>?)
@@ -2377,7 +2377,7 @@ Map<String, dynamic> _$InputMediaAnimationToJson(InputMediaAnimation instance) {
   writeNotNull('parse_mode', instance.parseMode);
   writeNotNull('caption_entities',
       instance.captionEntities?.map((e) => e.toJson()).toList());
-  writeNotNull('thumb', instance.thumb);
+  writeNotNull('thumbnail', instance.thumbnail);
   writeNotNull('width', instance.width);
   writeNotNull('height', instance.height);
   writeNotNull('duration', instance.duration);
@@ -2389,7 +2389,7 @@ InputMediaAudio _$InputMediaAudioFromJson(Map<String, dynamic> json) =>
     InputMediaAudio(
       type: json['type'] as String? ?? InputMedia.typeAudio,
       media: json['media'] as String,
-      thumb: json['thumb'],
+      thumbnail: json['thumbnail'],
       caption: json['caption'] as String?,
       parseMode: json['parse_mode'] as String?,
       captionEntities: (json['caption_entities'] as List<dynamic>?)
@@ -2416,7 +2416,7 @@ Map<String, dynamic> _$InputMediaAudioToJson(InputMediaAudio instance) {
   writeNotNull('parse_mode', instance.parseMode);
   writeNotNull('caption_entities',
       instance.captionEntities?.map((e) => e.toJson()).toList());
-  writeNotNull('thumb', instance.thumb);
+  writeNotNull('thumbnail', instance.thumbnail);
   writeNotNull('duration', instance.duration);
   writeNotNull('performer', instance.performer);
   writeNotNull('title', instance.title);
@@ -2427,7 +2427,7 @@ InputMediaDocument _$InputMediaDocumentFromJson(Map<String, dynamic> json) =>
     InputMediaDocument(
       type: json['type'] as String? ?? InputMedia.typeDocument,
       media: json['media'] as String,
-      thumb: json['thumb'],
+      thumbnail: json['thumbnail'],
       caption: json['caption'] as String?,
       parseMode: json['parse_mode'] as String?,
       captionEntities: (json['caption_entities'] as List<dynamic>?)
@@ -2453,7 +2453,7 @@ Map<String, dynamic> _$InputMediaDocumentToJson(InputMediaDocument instance) {
   writeNotNull('parse_mode', instance.parseMode);
   writeNotNull('caption_entities',
       instance.captionEntities?.map((e) => e.toJson()).toList());
-  writeNotNull('thumb', instance.thumb);
+  writeNotNull('thumbnail', instance.thumbnail);
   writeNotNull(
       'disable_content_type_detection', instance.disableContentTypeDetection);
   return val;
@@ -2500,7 +2500,7 @@ InputMediaVideo _$InputMediaVideoFromJson(Map<String, dynamic> json) =>
       captionEntities: (json['caption_entities'] as List<dynamic>?)
           ?.map((e) => MessageEntity.fromJson(e as Map<String, dynamic>))
           .toList(),
-      thumb: json['thumb'],
+      thumbnail: json['thumbnail'],
       width: json['width'] as int?,
       height: json['height'] as int?,
       duration: json['duration'] as int?,
@@ -2524,7 +2524,7 @@ Map<String, dynamic> _$InputMediaVideoToJson(InputMediaVideo instance) {
   writeNotNull('parse_mode', instance.parseMode);
   writeNotNull('caption_entities',
       instance.captionEntities?.map((e) => e.toJson()).toList());
-  writeNotNull('thumb', instance.thumb);
+  writeNotNull('thumbnail', instance.thumbnail);
   writeNotNull('width', instance.width);
   writeNotNull('height', instance.height);
   writeNotNull('duration', instance.duration);
@@ -3863,9 +3863,9 @@ StickerSet _$StickerSetFromJson(Map<String, dynamic> json) => StickerSet(
       stickers: (json['stickers'] as List<dynamic>)
           .map((e) => Sticker.fromJson(e as Map<String, dynamic>))
           .toList(),
-      thumb: json['thumb'] == null
+      thumbnail: json['thumbnail'] == null
           ? null
-          : PhotoSize.fromJson(json['thumb'] as Map<String, dynamic>),
+          : PhotoSize.fromJson(json['thumbnail'] as Map<String, dynamic>),
     );
 
 Map<String, dynamic> _$StickerSetToJson(StickerSet instance) {
@@ -3884,7 +3884,7 @@ Map<String, dynamic> _$StickerSetToJson(StickerSet instance) {
     }
   }
 
-  writeNotNull('thumb', instance.thumb?.toJson());
+  writeNotNull('thumbnail', instance.thumbnail?.toJson());
   return val;
 }
 
@@ -3895,9 +3895,9 @@ Sticker _$StickerFromJson(Map<String, dynamic> json) => Sticker(
       height: json['height'] as int,
       isAnimated: json['is_animated'] as bool,
       isVideo: json['is_video'] as bool,
-      thumb: json['thumb'] == null
+      thumbnail: json['thumbnail'] == null
           ? null
-          : PhotoSize.fromJson(json['thumb'] as Map<String, dynamic>),
+          : PhotoSize.fromJson(json['thumbnail'] as Map<String, dynamic>),
       emoji: json['emoji'] as String?,
       setName: json['set_name'] as String?,
       premiumAnimation: json['premium_animation'] == null
@@ -3928,7 +3928,7 @@ Map<String, dynamic> _$StickerToJson(Sticker instance) {
     }
   }
 
-  writeNotNull('thumb', instance.thumb?.toJson());
+  writeNotNull('thumbnail', instance.thumbnail?.toJson());
   writeNotNull('emoji', instance.emoji);
   writeNotNull('set_name', instance.setName);
   writeNotNull('premium_animation', instance.premiumAnimation?.toJson());
@@ -4156,9 +4156,9 @@ VideoNote _$VideoNoteFromJson(Map<String, dynamic> json) => VideoNote(
       fileUniqueId: json['file_unique_id'] as String,
       length: json['length'] as int,
       duration: json['duration'] as int,
-      thumb: json['thumb'] == null
+      thumbnail: json['thumbnail'] == null
           ? null
-          : PhotoSize.fromJson(json['thumb'] as Map<String, dynamic>),
+          : PhotoSize.fromJson(json['thumbnail'] as Map<String, dynamic>),
       fileSize: json['file_size'] as int?,
     );
 
@@ -4176,7 +4176,7 @@ Map<String, dynamic> _$VideoNoteToJson(VideoNote instance) {
     }
   }
 
-  writeNotNull('thumb', instance.thumb?.toJson());
+  writeNotNull('thumbnail', instance.thumbnail?.toJson());
   writeNotNull('file_size', instance.fileSize);
   return val;
 }
@@ -4187,9 +4187,9 @@ Video _$VideoFromJson(Map<String, dynamic> json) => Video(
       width: json['width'] as int,
       height: json['height'] as int,
       duration: json['duration'] as int,
-      thumb: json['thumb'] == null
+      thumbnail: json['thumbnail'] == null
           ? null
-          : PhotoSize.fromJson(json['thumb'] as Map<String, dynamic>),
+          : PhotoSize.fromJson(json['thumbnail'] as Map<String, dynamic>),
       fileName: json['file_name'] as String?,
       mimeType: json['mime_type'] as String?,
       fileSize: json['file_size'] as int?,
@@ -4210,7 +4210,7 @@ Map<String, dynamic> _$VideoToJson(Video instance) {
     }
   }
 
-  writeNotNull('thumb', instance.thumb?.toJson());
+  writeNotNull('thumbnail', instance.thumbnail?.toJson());
   writeNotNull('file_name', instance.fileName);
   writeNotNull('mime_type', instance.mimeType);
   writeNotNull('file_size', instance.fileSize);
diff --git a/lib/src/telegram/models/animation.dart b/lib/src/telegram/models/animation.dart
index d8704be..567207a 100644
--- a/lib/src/telegram/models/animation.dart
+++ b/lib/src/telegram/models/animation.dart
@@ -28,7 +28,7 @@ class Animation {
   int width;
   int height;
   int duration;
-  PhotoSize? thumb;
+  PhotoSize? thumbnail;
   String? fileName;
   String? mimeType;
   int? fileSize;
@@ -39,7 +39,7 @@ class Animation {
     required this.width,
     required this.height,
     required this.duration,
-    this.thumb,
+    this.thumbnail,
     this.fileName,
     this.mimeType,
     this.fileSize,
diff --git a/lib/src/telegram/models/audio.dart b/lib/src/telegram/models/audio.dart
index cca2058..bc1c3a5 100644
--- a/lib/src/telegram/models/audio.dart
+++ b/lib/src/telegram/models/audio.dart
@@ -31,7 +31,7 @@ class Audio {
   String? fileName;
   String? mimeType;
   int? fileSize;
-  PhotoSize? thumb;
+  PhotoSize? thumbnail;
 
   Audio({
     required this.fileId,
@@ -42,7 +42,7 @@ class Audio {
     this.fileName,
     this.mimeType,
     this.fileSize,
-    this.thumb,
+    this.thumbnail,
   });
 
   @JsonKey(includeFromJson: false, includeToJson: false)
diff --git a/lib/src/telegram/models/document.dart b/lib/src/telegram/models/document.dart
index 5992fdc..f31d55d 100644
--- a/lib/src/telegram/models/document.dart
+++ b/lib/src/telegram/models/document.dart
@@ -29,14 +29,14 @@ part of '../model.dart';
 class Document {
   String fileId;
   String fileUniqueId;
-  PhotoSize? thumb;
+  PhotoSize? thumbnail;
   String? fileName;
   String? mimeType;
   int? fileSize;
   Document({
     required this.fileId,
     required this.fileUniqueId,
-    this.thumb,
+    this.thumbnail,
     this.fileName,
     this.mimeType,
     this.fileSize,
diff --git a/lib/src/telegram/models/input_media_animation.dart b/lib/src/telegram/models/input_media_animation.dart
index b5ef95b..2a845ea 100644
--- a/lib/src/telegram/models/input_media_animation.dart
+++ b/lib/src/telegram/models/input_media_animation.dart
@@ -33,7 +33,7 @@ class InputMediaAnimation implements InputMedia {
   String? parseMode;
   @override
   List<MessageEntity>? captionEntities;
-  dynamic thumb; // InputFile or String
+  dynamic thumbnail; // InputFile or String
   int? width;
   int? height;
   int? duration;
@@ -42,7 +42,7 @@ class InputMediaAnimation implements InputMedia {
   InputMediaAnimation(
       {this.type = InputMedia.typeAnimation,
       required this.media,
-      this.thumb,
+      this.thumbnail,
       this.caption,
       this.parseMode,
       this.captionEntities,
diff --git a/lib/src/telegram/models/input_media_audio.dart b/lib/src/telegram/models/input_media_audio.dart
index be8d6d7..aca58d0 100644
--- a/lib/src/telegram/models/input_media_audio.dart
+++ b/lib/src/telegram/models/input_media_audio.dart
@@ -33,7 +33,7 @@ class InputMediaAudio implements InputMedia {
   String? parseMode;
   @override
   List<MessageEntity>? captionEntities;
-  dynamic thumb; // InputFile or String
+  dynamic thumbnail; // InputFile or String
   int? duration;
   String? performer;
   String? title;
@@ -41,7 +41,7 @@ class InputMediaAudio implements InputMedia {
   InputMediaAudio({
     this.type = InputMedia.typeAudio,
     required this.media,
-    this.thumb,
+    this.thumbnail,
     this.caption,
     this.parseMode,
     this.captionEntities,
diff --git a/lib/src/telegram/models/input_media_document.dart b/lib/src/telegram/models/input_media_document.dart
index 4e50262..277096e 100644
--- a/lib/src/telegram/models/input_media_document.dart
+++ b/lib/src/telegram/models/input_media_document.dart
@@ -33,12 +33,12 @@ class InputMediaDocument implements InputMedia {
   String? parseMode;
   @override
   List<MessageEntity>? captionEntities;
-  dynamic thumb; // InputFile or String
+  dynamic thumbnail; // InputFile or String
   bool? disableContentTypeDetection;
   InputMediaDocument({
     this.type = InputMedia.typeDocument,
     required this.media,
-    this.thumb,
+    this.thumbnail,
     this.caption,
     this.parseMode,
     this.captionEntities,
diff --git a/lib/src/telegram/models/input_media_video.dart b/lib/src/telegram/models/input_media_video.dart
index 018aee4..ec3678d 100644
--- a/lib/src/telegram/models/input_media_video.dart
+++ b/lib/src/telegram/models/input_media_video.dart
@@ -33,7 +33,7 @@ class InputMediaVideo implements InputMedia {
   String? parseMode;
   @override
   List<MessageEntity>? captionEntities;
-  dynamic thumb; // InputFile or String
+  dynamic thumbnail; // InputFile or String
   int? width;
   int? height;
   int? duration;
@@ -46,7 +46,7 @@ class InputMediaVideo implements InputMedia {
     this.caption,
     this.parseMode,
     this.captionEntities,
-    this.thumb,
+    this.thumbnail,
     this.width,
     this.height,
     this.duration,
diff --git a/lib/src/telegram/models/sticker.dart b/lib/src/telegram/models/sticker.dart
index 3a7db3a..30d4a96 100644
--- a/lib/src/telegram/models/sticker.dart
+++ b/lib/src/telegram/models/sticker.dart
@@ -29,7 +29,7 @@ class Sticker {
   int height;
   bool isAnimated;
   bool isVideo;
-  PhotoSize? thumb;
+  PhotoSize? thumbnail;
   String? emoji;
   String? setName;
   File? premiumAnimation;
@@ -44,7 +44,7 @@ class Sticker {
     required this.height,
     required this.isAnimated,
     required this.isVideo,
-    this.thumb,
+    this.thumbnail,
     this.emoji,
     this.setName,
     this.premiumAnimation,
diff --git a/lib/src/telegram/models/sticker_set.dart b/lib/src/telegram/models/sticker_set.dart
index 5184753..5fcf6ab 100644
--- a/lib/src/telegram/models/sticker_set.dart
+++ b/lib/src/telegram/models/sticker_set.dart
@@ -29,7 +29,7 @@ class StickerSet {
   bool isAnimated;
   bool isVideo;
   List<Sticker> stickers;
-  PhotoSize? thumb;
+  PhotoSize? thumbnail;
   StickerSet({
     required this.name,
     required this.title,
@@ -37,7 +37,7 @@ class StickerSet {
     required this.isAnimated,
     required this.isVideo,
     required this.stickers,
-    this.thumb,
+    this.thumbnail,
   });
   factory StickerSet.fromJson(Map<String, dynamic> json) =>
       _$StickerSetFromJson(json);
diff --git a/lib/src/telegram/models/video.dart b/lib/src/telegram/models/video.dart
index 650f1eb..25a15d4 100644
--- a/lib/src/telegram/models/video.dart
+++ b/lib/src/telegram/models/video.dart
@@ -28,7 +28,7 @@ class Video {
   int width;
   int height;
   int duration;
-  PhotoSize? thumb;
+  PhotoSize? thumbnail;
   String? fileName;
   String? mimeType;
   int? fileSize;
@@ -39,7 +39,7 @@ class Video {
     required this.width,
     required this.height,
     required this.duration,
-    this.thumb,
+    this.thumbnail,
     this.fileName,
     this.mimeType,
     this.fileSize,
diff --git a/lib/src/telegram/models/video_note.dart b/lib/src/telegram/models/video_note.dart
index d453626..c031086 100644
--- a/lib/src/telegram/models/video_note.dart
+++ b/lib/src/telegram/models/video_note.dart
@@ -30,7 +30,7 @@ class VideoNote {
   String fileUniqueId;
   int length;
   int duration;
-  PhotoSize? thumb;
+  PhotoSize? thumbnail;
   int? fileSize;
 
   VideoNote({
@@ -38,7 +38,7 @@ class VideoNote {
     required this.fileUniqueId,
     required this.length,
     required this.duration,
-    this.thumb,
+    this.thumbnail,
     this.fileSize,
   });
 
diff --git a/lib/src/telegram/telegram.dart b/lib/src/telegram/telegram.dart
index 633a395..5107eb9 100644
--- a/lib/src/telegram/telegram.dart
+++ b/lib/src/telegram/telegram.dart
@@ -340,7 +340,7 @@ class Telegram {
       int? duration,
       String? performer,
       String? title,
-      dynamic thumb,
+      dynamic thumbnail,
       bool? disableNotification,
       bool? protectContent,
       int? replyToMessageId,
@@ -379,14 +379,14 @@ class Telegram {
           'Attribute \'audio\' can only be either io.File or String (Telegram fileId or image url)'));
     }
 
-    if (thumb != null) {
-      if (thumb is io.File) {
-        multiPartFiles.add(HttpClient.toMultiPartFile(thumb, 'thumb'));
-      } else if (thumb is String) {
-        body.addAll({'thumb': thumb});
+    if (thumbnail != null) {
+      if (thumbnail is io.File) {
+        multiPartFiles.add(HttpClient.toMultiPartFile(thumbnail, 'thumbnail'));
+      } else if (thumbnail is String) {
+        body.addAll({'thumbnail': thumbnail});
       } else {
         return Future.error(TelegramException(
-            'Attribute \'thumb\' can only be either io.File or String (Telegram fileId or image url)'));
+            'Attribute \'thumbnail\' can only be either io.File or String (Telegram fileId or image url)'));
       }
     }
 
@@ -407,7 +407,7 @@ class Telegram {
   /// https://core.telegram.org/bots/api#senddocument
   Future<Message> sendDocument(dynamic chatId, dynamic document,
       {int? messageThreadId,
-      dynamic thumb,
+      dynamic thumbnail,
       String? caption,
       String? parseMode,
       List<MessageEntity>? captionEntities,
@@ -448,14 +448,14 @@ class Telegram {
           'Attribute \'document\' can only be either io.File or String (Telegram fileId or image url)'));
     }
 
-    if (thumb != null) {
-      if (thumb is io.File) {
-        multiPartFiles.add(HttpClient.toMultiPartFile(thumb, 'thumb'));
-      } else if (thumb is String) {
-        body.addAll({'thumb': thumb});
+    if (thumbnail != null) {
+      if (thumbnail is io.File) {
+        multiPartFiles.add(HttpClient.toMultiPartFile(thumbnail, 'thumbnail'));
+      } else if (thumbnail is String) {
+        body.addAll({'thumbnail': thumbnail});
       } else {
         return Future.error(TelegramException(
-            'Attribute \'thumb\' can only be either io.File or String (Telegram fileId or image url)'));
+            'Attribute \'thumbnail\' can only be either io.File or String (Telegram fileId or image url)'));
       }
     }
 
@@ -481,7 +481,7 @@ class Telegram {
       int? duration,
       int? width,
       int? height,
-      dynamic thumb,
+      dynamic thumbnail,
       String? caption,
       String? parseMode,
       List<MessageEntity>? captionEntities,
@@ -527,14 +527,14 @@ class Telegram {
           'Attribute \'video\' can only be either io.File or String (Telegram fileId or image url)'));
     }
 
-    if (thumb != null) {
-      if (thumb is io.File) {
-        multiPartFiles.add(HttpClient.toMultiPartFile(thumb, 'thumb'));
-      } else if (thumb is String) {
-        body.addAll({'thumb': thumb});
+    if (thumbnail != null) {
+      if (thumbnail is io.File) {
+        multiPartFiles.add(HttpClient.toMultiPartFile(thumbnail, 'thumbnail'));
+      } else if (thumbnail is String) {
+        body.addAll({'thumbnail': thumbnail});
       } else {
         return Future.error(TelegramException(
-            'Attribute \'thumb\' can only be either io.File or String (Telegram fileId or image url)'));
+            'Attribute \'thumbnail\' can only be either io.File or String (Telegram fileId or image url)'));
       }
     }
 
@@ -557,7 +557,7 @@ class Telegram {
       int? duration,
       int? width,
       int? height,
-      dynamic thumb,
+      dynamic thumbnail,
       String? caption,
       String? parseMode,
       List<MessageEntity>? captionEntities,
@@ -601,14 +601,14 @@ class Telegram {
           'Attribute \'animation\' can only be either io.File or String (Telegram fileId or image url)'));
     }
 
-    if (thumb != null) {
-      if (thumb is io.File) {
-        multiPartFiles.add(HttpClient.toMultiPartFile(thumb, 'thumb'));
-      } else if (thumb is String) {
-        body.addAll({'thumb': thumb});
+    if (thumbnail != null) {
+      if (thumbnail is io.File) {
+        multiPartFiles.add(HttpClient.toMultiPartFile(thumbnail, 'thumbnail'));
+      } else if (thumbnail is String) {
+        body.addAll({'thumbnail': thumbnail});
       } else {
         return Future.error(TelegramException(
-            'Attribute \'thumb\' can only be either io.File or String (Telegram fileId or image url)'));
+            'Attribute \'thumbnail\' can only be either io.File or String (Telegram fileId or image url)'));
       }
     }
 
@@ -694,7 +694,7 @@ class Telegram {
       {int? messageThreadId,
       int? duration,
       int? length,
-      dynamic thumb,
+      dynamic thumbnail,
       bool? disableNotification,
       bool? protectContent,
       int? replyToMessageId,
@@ -728,14 +728,14 @@ class Telegram {
           'Attribute \'videoNote\' can only be either io.File or String (Telegram fileId or image url)'));
     }
 
-    if (thumb != null) {
-      if (thumb is io.File) {
-        multiPartFiles.add(HttpClient.toMultiPartFile(thumb, 'thumb'));
-      } else if (thumb is String) {
-        body.addAll({'thumb': thumb});
+    if (thumbnail != null) {
+      if (thumbnail is io.File) {
+        multiPartFiles.add(HttpClient.toMultiPartFile(thumbnail, 'thumbnail'));
+      } else if (thumbnail is String) {
+        body.addAll({'thumbnail': thumbnail});
       } else {
         return Future.error(TelegramException(
-            'Attribute \'thumb\' can only be either io.File or String (Telegram fileId or image url)'));
+            'Attribute \'thumbnail\' can only be either io.File or String (Telegram fileId or image url)'));
       }
     }
 
@@ -2629,13 +2629,12 @@ class Telegram {
     return await HttpClient.httpPost(requestUrl, body: body);
   }
 
-  /// Use this method to change the [mask position] of a mask sticker.
+  /// Use this method to change the [MaskPosition] of a mask sticker.
   /// The sticker must belong to a sticker set that was created by the bot.
   ///
   /// Returns *True* on success.
   ///
   /// https://core.telegram.org/bots/api#setstickermaskposition
-  /// [mask position](https://core.telegram.org/bots/api#maskposition)
   Future<bool> setStickerMaskPosition(String sticker, MaskPosition? maskPosition) async {
     var requestUrl = _apiUri('setStickerMaskPosition');
     var body = <String, dynamic>{
@@ -2667,27 +2666,27 @@ class Telegram {
   ///
   /// https://core.telegram.org/bots/api#setstickersetthumbnail
   Future<bool> setStickerSetThumbnail(String name, int userId,
-      {dynamic thumb}) async {
+      {dynamic thumbnail}) async {
     var requestUrl = _apiUri('setStickerSetThumbnail');
     var body = <String, dynamic>{
       'name': name,
       'user_id': userId,
     };
-    if (thumb == null) {
+    if (thumbnail == null) {
       return await HttpClient.httpPost(requestUrl, body: body);
-    } else if (thumb is io.File) {
+    } else if (thumbnail is io.File) {
       // filename cannot be empty to post to Telegram server
       var files = List<MultipartFile>.filled(
           1,
-          MultipartFile('thumb', thumb.openRead(), thumb.lengthSync(),
-              filename: '${thumb.lengthSync()}'));
+          MultipartFile('thumbnail', thumbnail.openRead(), thumbnail.lengthSync(),
+              filename: '${thumbnail.lengthSync()}'));
       return await HttpClient.httpMultipartPost(requestUrl, files, body: body);
-    } else if (thumb is String) {
-      body.addAll({'thumb': thumb});
+    } else if (thumbnail is String) {
+      body.addAll({'thumbnail': thumbnail});
       return await HttpClient.httpPost(requestUrl, body: body);
     } else {
       return Future.error(TelegramException(
-          'Attribute \'thumb\' can only be either io.File or String (Telegram fileId or image url)'));
+          'Attribute \'thumbnail\' can only be either io.File or String (Telegram fileId or image url)'));
     }
   }