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-rw-r--r--synapse/handlers/message.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index ce1fa3c78e..61cb133ef2 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -992,6 +992,8 @@ class EventCreationHandler:
             and full_state_ids_at_event
             and builder.internal_metadata.is_historical()
         ):
+            # TODO(faster_joins): figure out how this works, and make sure that the
+            #   old state is complete.
             old_state = await self.store.get_events_as_list(full_state_ids_at_event)
             context = await self.state.compute_event_context(event, old_state=old_state)
         else: