diff --git a/chatkit/types.py b/chatkit/types.py
index ea43de9..1c34b9f 100644
--- a/chatkit/types.py
+++ b/chatkit/types.py
@@ -637,6 +637,7 @@ class UserMessageTagContent(BaseModel):
     id: str
     text: str
     data: dict[str, Any]
+    group: str | None = None
     interactive: bool = False
 
 
@@ -813,9 +814,14 @@ class EntitySource(SourceBase):
     type: Literal["entity"] = "entity"
     id: str
     icon: IconName | None = None
-    preview: Literal["lazy"] | None = None
     data: dict[str, Any] = Field(default_factory=dict)
 
+    preview: Literal["lazy"] | None = Field(
+        default=None,
+        deprecated=True,
+        description="This field is ignored. Please use the entities.onRequestPreview ChatKit.js option instead.",
+    )
+
 
 Source = Annotated[
     URLSource | FileSource | EntitySource,