diff --git a/proto/milvus.proto b/proto/milvus.proto
index e3403ca..a49ffbb 100644
--- a/proto/milvus.proto
+++ b/proto/milvus.proto
@@ -282,6 +282,22 @@ message AlterCollectionRequest {
   string collection_name = 3;
   int64  collectionID = 4;
   repeated common.KeyValuePair properties = 5;
+  repeater string delete_keys = 6;
+}
+
+message AlterCollectionFieldRequest {
+  option (common.privilege_ext_obj) = {
+    object_type: Global
+    object_privilege: PrivilegeCreateCollection
+    object_name_index: -1
+  };
+  // Not useful for now
+  common.MsgBase base = 1;
+  string db_name = 2;
+  // The unique collection name in milvus.(Required)
+  string collection_name = 3;
+  string field_name =4;
+  repeated common.KeyValuePair properties = 5;
 }
 
 /**