1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index cd79e23f4b..2c6488dd1b 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -415,6 +415,8 @@ class FederationServer(FederationBase):
                 pdu.internal_metadata.outlier = True
             elif min_depth and pdu.depth > min_depth:
                 if get_missing and prevs - seen:
+                    logger.debug("We're missing: %r", prevs-seen)
+
                     latest = yield self.store.get_latest_event_ids_in_room(
                         pdu.room_id
                     )