diff --git a/src/judas_server/backend/backend_server.py b/src/judas_server/backend/backend_server.py
index 4529297..cce28a7 100644
--- a/src/judas_server/backend/backend_server.py
+++ b/src/judas_server/backend/backend_server.py
@@ -124,6 +124,11 @@ class BackendServer:
     def _save_known_clients(self) -> None:
         """Save the list of known clients to a YAML file."""
         with open("config/known_clients.yaml", "w") as f:
+            f.write(
+                "# This file is automatically generated by BackendServer.\n"
+                + "# Do not edit manually.\n"
+                + f"# Generated at: {time.strftime('%Y-%m-%d %H:%M:%S', time.localtime())}\n\n"
+            )
             yaml.safe_dump({"known_clients": self.known_clients}, f)
         self.logger.debug("Saved known clients")