diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
index 8f214368bf2b..d6b8485278b6 100644
--- a/synapse/handlers/typing.py
+++ b/synapse/handlers/typing.py
@@ -362,6 +362,7 @@ async def _recv_edu(self, origin: str, content: JsonDict) -> None:
             )
             return
 
+        # Check whether the current server is in the room.
         if await self.store.is_host_joined(room_id, self.server_name):
             logger.info("Got typing update from %s: %r", user_id, content)
             now = self.clock.time_msec()