1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/replication/tcp/protocol.py b/synapse/replication/tcp/protocol.py
index 825900f64c..e829add257 100644
--- a/synapse/replication/tcp/protocol.py
+++ b/synapse/replication/tcp/protocol.py
@@ -104,7 +104,7 @@ tcp_outbound_commands_counter = Counter(
 
 # A list of all connected protocols. This allows us to send metrics about the
 # connections.
-connected_connections = []
+connected_connections = []  # type: List[BaseReplicationStreamProtocol]
 
 
 logger = logging.getLogger(__name__)