1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py

index c38690c415..90ccd7bae6 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -377,7 +377,7 @@ class RoomCreationHandler(BaseHandler):
         creation_content = {
             "room_version": new_room_version.identifier,
             "predecessor": {"room_id": old_room_id, "event_id": tombstone_event_id},
-        }
+        }  # type: JsonDict
 
         # Check if old room was non-federatable