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-rw-r--r--synapse/handlers/federation.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index a03a5f494c..5f3562b5b5 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -239,6 +239,9 @@ class FederationHandler(BaseHandler):
                 )
                 prev_state = context.current_state.get((event.type, event.state_key))
                 if not prev_state or prev_state.membership != Membership.JOIN:
+                    # Only fire user_joined_room if the user has acutally
+                    # joined the room. Don't bother if the user is just
+                    # changing their profile info.
                     user = UserID.from_string(event.state_key)
                     yield user_joined_room(self.distributor, user, event.room_id)