diff --git a/CHANGELOG.md b/CHANGELOG.md
index e37b78c43..8807efcf1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,7 @@
 
 ### Added
 
+* nostr: add `TagKind::Client` variant ([Yuki Kishimoto])
 * relay-builder: add `LocalRelay` and `RelayBuilder` ([Yuki Kishimoto])
 * relay-builder: allow to serve local relay as hidden service ([Yuki Kishimoto])
 * relay-builder: allow to set number of max connections allowed ([Yuki Kishimoto])
diff --git a/bindings/nostr-ffi/src/event/tag.rs b/bindings/nostr-ffi/src/event/tag.rs
index 51794a701..9c59f75cf 100644
--- a/bindings/nostr-ffi/src/event/tag.rs
+++ b/bindings/nostr-ffi/src/event/tag.rs
@@ -117,6 +117,10 @@ pub enum TagKind {
     Encrypted,
     Request,
     Word,
+    /// Client
+    ///
+    /// <https://github.com/nostr-protocol/nips/blob/master/89.md>
+    Client,
     Unknown {
         unknown: String,
     },
@@ -170,6 +174,7 @@ impl<'a> From<tag::TagKind<'a>> for TagKind {
             tag::TagKind::Encrypted => Self::Encrypted,
             tag::TagKind::Request => Self::Request,
             tag::TagKind::Word => Self::Word,
+            tag::TagKind::Client => Self::Client,
             tag::TagKind::Custom(unknown) => Self::Unknown {
                 unknown: unknown.to_string(),
             },
@@ -223,6 +228,7 @@ impl<'a> From<TagKind> for tag::TagKind<'a> {
             TagKind::Encrypted => Self::Encrypted,
             TagKind::Request => Self::Request,
             TagKind::Word => Self::Word,
+            TagKind::Client => Self::Client,
             TagKind::Unknown { unknown } => Self::Custom(Cow::Owned(unknown)),
         }
     }
diff --git a/crates/nostr/src/event/tag/kind.rs b/crates/nostr/src/event/tag/kind.rs
index 3d5d087cb..01a0b42a4 100644
--- a/crates/nostr/src/event/tag/kind.rs
+++ b/crates/nostr/src/event/tag/kind.rs
@@ -103,6 +103,10 @@ pub enum TagKind<'a> {
     Request,
     /// Word
     Word,
+    /// Client
+    ///
+    /// <https://github.com/nostr-protocol/nips/blob/master/89.md>
+    Client,
     /// Custom tag kind
     Custom(Cow<'a, str>),
 }
@@ -166,6 +170,7 @@ impl<'a> fmt::Display for TagKind<'a> {
             Self::Encrypted => write!(f, "encrypted"),
             Self::Request => write!(f, "request"),
             Self::Word => write!(f, "word"),
+            Self::Client => write!(f, "client"),
             Self::Custom(tag) => write!(f, "{tag}"),
         }
     }
@@ -216,6 +221,7 @@ impl<'a> From<&'a str> for TagKind<'a> {
             "encrypted" => Self::Encrypted,
             "request" => Self::Request,
             "word" => Self::Word,
+            "client" => Self::Client,
             k => match SingleLetterTag::from_str(k) {
                 Ok(s) => Self::SingleLetter(s),
                 Err(..) => Self::Custom(Cow::Borrowed(k)),