diff --git a/server.py b/server.py
index 1dab0d1..fe1e9d7 100644
--- a/server.py
+++ b/server.py
@@ -11,6 +11,7 @@ import signal
 import sys
 from typing import Set
 
+# Branch protected file - see POLICY.md
 import websockets
 
 # Configuration