diff --git a/changelog.d/10050.misc b/changelog.d/10050.misc
new file mode 100644
index 000000000000..7db497bdceb5
--- /dev/null
+++ b/changelog.d/10050.misc
@@ -0,0 +1 @@
+Fix `get_state_ids_for_event` return type typo to match what the function actually does.
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index cfafba22c5e0..c9dce726cb0e 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -540,7 +540,7 @@ async def get_state_ids_for_event(
             state_filter: The state filter used to fetch state from the database.
 
         Returns:
-            A dict from (type, state_key) -> state_event
+            A dict from (type, state_key) -> state_event_id
         """
         state_map = await self.get_state_ids_for_events(
             [event_id], state_filter or StateFilter.all()