diff --git a/docker/.env.example b/docker/.env.example
index d8b8c49ed3..29073fa1b0 100644
--- a/docker/.env.example
+++ b/docker/.env.example
@@ -959,6 +959,7 @@ PLUGIN_DEBUGGING_PORT=5003
 EXPOSE_PLUGIN_DEBUGGING_HOST=localhost
 EXPOSE_PLUGIN_DEBUGGING_PORT=5003
 
+# If this key is changed, DIFY_INNER_API_KEY in plugin_daemon service must also be updated or agent node will fail.
 PLUGIN_DIFY_INNER_API_KEY=QaHbTe77CtuXmsfyhR7+vRjI/+XbV1AaFy691iy+kGDv2Jvy0/eAh8Y1
 PLUGIN_DIFY_INNER_API_URL=http://api:5001