diff --git a/etc/emqx.conf b/etc/emqx.conf
index 54a3eff6f..65f7d8443 100644
--- a/etc/emqx.conf
+++ b/etc/emqx.conf
@@ -655,6 +655,15 @@ zone.external.max_mqueue_len = 1000
 ## Value: false | true
 zone.external.mqueue_store_qos0 = true
 
+## All the topics will be prefixed with the mountpoint path if this option is enabled.
+##
+## Variables in mountpoint path:
+##  - %c: clientid
+##  - %u: username
+##
+## Value: String
+## zone.external.mountpoint = devicebound/
+
 ##--------------------------------------------------------------------
 ## Internal Zone
 
@@ -705,6 +714,15 @@ zone.internal.max_mqueue_len = 1000
 ## Value: false | true
 zone.internal.mqueue_store_qos0 = true
 
+## All the topics will be prefixed with the mountpoint path if this option is enabled.
+##
+## Variables in mountpoint path:
+##  - %c: clientid
+##  - %u: username
+##
+## Value: String
+## zone.internal.mountpoint = cloudbound/
+
 ##--------------------------------------------------------------------
 ## Listeners
 ##--------------------------------------------------------------------
diff --git a/priv/emqx.schema b/priv/emqx.schema
index 9172e401e..dc2acdd0a 100644
--- a/priv/emqx.schema
+++ b/priv/emqx.schema
@@ -815,6 +815,10 @@ end}.
   {datatype, string}
 ]}.
 
+{mapping, "zone.$name.mountpoint", "emqx.zones", [
+  {datatype, string}
+]}.
+
 {translation, "emqx.zones", fun(Conf) ->
   Mapping = fun("retain_available", Val) ->
                     {mqtt_retain_available, Val};