diff --git a/etc/emqx.conf b/etc/emqx.conf
index 4a7c195d2..2bba8d024 100644
--- a/etc/emqx.conf
+++ b/etc/emqx.conf
@@ -1209,7 +1209,7 @@ listener.ws.external = 8083
 
 ## The path of WebSocket MQTT endpoint
 ##
-## Value: / | /<Any String>
+## Value: URL Path
 listener.ws.external.mqtt_path = /mqtt
 
 ## The acceptor pool for external MQTT/WebSocket listener.
@@ -1353,7 +1353,7 @@ listener.wss.external = 8084
 
 ## The path of WebSocket MQTT endpoint
 ##
-## Value: / | /<Any String>
+## Value: URL Path
 listener.wss.external.mqtt_path = /mqtt
 
 ## The acceptor pool for external MQTT/WebSocket/SSL listener.