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-rw-r--r--synapse/storage/roommember.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 5f044a3f18..e38d8927bf 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -276,6 +276,8 @@ class RoomMemberStore(SQLBaseStore):
 
     @cachedInlineCallbacks(max_entries=500000, iterable=True)
     def get_rooms_for_user(self, user_id):
+        """Returns a set of room_ids the user is currently joined to
+        """
         rooms = yield self.get_rooms_for_user_where_membership_is(
             user_id, membership_list=[Membership.JOIN],
         )