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-rw-r--r--synapse/handlers/federation.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index a38300ec6a..654fd3829f 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -294,6 +294,7 @@ class FederationHandler(BaseHandler):
             extremities=extremities,
         )
 
+        # Don't bother processing events we already have.
         seen_events = yield self.store.have_events_in_timeline(
             set(e.event_id for e in events)
         )