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-rw-r--r--synapse/storage/keys.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/storage/keys.py b/synapse/storage/keys.py
index f547977600..a1331c1a61 100644
--- a/synapse/storage/keys.py
+++ b/synapse/storage/keys.py
@@ -134,6 +134,7 @@ class KeyStore(SQLBaseStore):
         """
         key_id = "%s:%s" % (verify_key.alg, verify_key.version)
 
+        # XXX fix this to not need a lock (#3819)
         def _txn(txn):
             self._simple_upsert_txn(
                 txn,