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-rw-r--r--synapse/storage/state.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index c02130d9d6..c3ab7db7ae 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -446,7 +446,7 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
             room_id (str)
 
         Returns:
-            Deferred[str]: predecessor room id
+            Deferred[unicode|None]: predecessor room id
         """
         state_ids = yield self.get_current_state_ids(room_id)
         create_id = state_ids.get((EventTypes.Create, ""))