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-rw-r--r--synapse/visibility.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/visibility.py b/synapse/visibility.py
index 27061e4ad9..6209bc0cde 100644
--- a/synapse/visibility.py
+++ b/synapse/visibility.py
@@ -291,6 +291,8 @@ def filter_events_for_server(store, server_name, events):
     def include(typ, state_key):
         if typ != EventTypes.Member:
             return True
+
+        # we avoid using get_domain_from_id here for efficiency.
         idx = state_key.find(":")
         if idx == -1:
             return False