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-rw-r--r--synapse/handlers/room.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 6e1c37df03..52a9788823 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -378,6 +378,7 @@ class RoomMemberHandler(BaseHandler):
         else:
             # This is not a JOIN, so we can handle it normally.
 
+            # FIXME: This isn't idempotency.
             if prev_state and prev_state.membership == event.membership:
                 # double same action, treat this event as a NOOP.
                 defer.returnValue({})