1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index b1dab57447..766d9849f5 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -1980,6 +1980,10 @@ class FederationEventHandler:
             event, event_pos, max_stream_token, extra_users=extra_users
         )
 
+        if event.type == EventTypes.Member and event.membership == Membership.JOIN:
+            # TODO retrieve the previous state, and exclude join -> join transitions
+            self._notifier.notify_user_joined_room(event.event_id, event.room_id)
+
     def _sanity_check_event(self, ev: EventBase) -> None:
         """
         Do some early sanity checks of a received event