diff --git a/changelog.d/6167.misc b/changelog.d/6167.misc
new file mode 100644
index 0000000000000000000000000000000000000000..32c96b36819c9aad4b8cfd8692ccb7e4c6c4ebfd
--- /dev/null
+++ b/changelog.d/6167.misc
@@ -0,0 +1 @@
+Add some logging to the rooms stats updates, to try to track down a flaky test.
diff --git a/synapse/handlers/stats.py b/synapse/handlers/stats.py
index cbac7c347aabd274fa54c9123a63188f2422c719..c62b113115f5ca85e6285438fbe1c9b8e687e6a2 100644
--- a/synapse/handlers/stats.py
+++ b/synapse/handlers/stats.py
@@ -293,6 +293,7 @@ class StatsHandler(StateDeltasHandler):
                 room_state["guest_access"] = event_content.get("guest_access")
 
         for room_id, state in room_to_state_updates.items():
+            logger.info("Updating room_stats_state for %s: %s", room_id, state)
             yield self.store.update_room_state(room_id, state)
 
         return room_to_stats_deltas, user_to_stats_deltas
diff --git a/synapse/storage/stats.py b/synapse/storage/stats.py
index 09190d684e9694283d46b58b5f3880331b173aff..7c224cd3d9d81ea184ea57009da426da063daba0 100644
--- a/synapse/storage/stats.py
+++ b/synapse/storage/stats.py
@@ -332,6 +332,9 @@ class StatsStore(StateDeltasStore):
         def _bulk_update_stats_delta_txn(txn):
             for stats_type, stats_updates in updates.items():
                 for stats_id, fields in stats_updates.items():
+                    logger.info(
+                        "Updating %s stats for %s: %s", stats_type, stats_id, fields
+                    )
                     self._update_stats_delta_txn(
                         txn,
                         ts=ts,