diff --git a/python/packages/autogen-core/src/autogen_core/_agent_runtime.py b/python/packages/autogen-core/src/autogen_core/_agent_runtime.py
index 6510d84fbe17..22493626f911 100644
--- a/python/packages/autogen-core/src/autogen_core/_agent_runtime.py
+++ b/python/packages/autogen-core/src/autogen_core/_agent_runtime.py
@@ -62,7 +62,7 @@ async def publish_message(
 
         Args:
             message (Any): The message to publish.
-            topic (TopicId): The topic to publish the message to.
+            topic_id (TopicId): The topic to publish the message to.
             sender (AgentId | None, optional): The agent which sent the message. Defaults to None.
             cancellation_token (CancellationToken | None, optional): Token used to cancel an in progress. Defaults to None.
             message_id (str | None, optional): The message id. If None, a new message id will be generated. Defaults to None. This message id must be unique. and is recommended to be a UUID.