diff --git a/etc/emqx.conf b/etc/emqx.conf
index f302af423..b7ff0d654 100644
--- a/etc/emqx.conf
+++ b/etc/emqx.conf
@@ -527,7 +527,7 @@ zone.external.idle_timeout = 15s
 ##
 ## Value: Number,Duration
 ## Example: 10 messages per minute.
-zone.external.publish_limit = 10,1m
+## zone.external.publish_limit = 10,1m
 
 ## Enable ACL check.
 ##