diff --git a/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_schema.erl b/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_schema.erl
index 12bcc5a86..6770c6774 100644
--- a/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_schema.erl
+++ b/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_schema.erl
@@ -38,6 +38,7 @@ fields("auto_subscribe") ->
 
 fields("topic") ->
     [ {topic, sc(binary(), #{
+        required => true,
         example => topic_example(),
         desc => ?DESC("topic")})}
     , {qos, sc(emqx_schema:qos(), #{
diff --git a/apps/emqx_management/src/emqx_mgmt_api_banned.erl b/apps/emqx_management/src/emqx_mgmt_api_banned.erl
index fd542e1f4..1354b9ac8 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_banned.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_banned.erl
@@ -87,12 +87,14 @@ schema("/banned/:as/:who") ->
                 {as,
                     hoconsc:mk(hoconsc:enum(?BANNED_TYPES), #{
                         desc => ?DESC(as),
+                        required => true,
                         in => path,
                         example => username
                     })},
                 {who,
                     hoconsc:mk(binary(), #{
                         desc => ?DESC(who),
+                        required => true,
                         in => path,
                         example => <<"Badass">>
                     })}
diff --git a/apps/emqx_modules/src/emqx_modules_schema.erl b/apps/emqx_modules/src/emqx_modules_schema.erl
index fd166c89e..9c1e07dbb 100644
--- a/apps/emqx_modules/src/emqx_modules_schema.erl
+++ b/apps/emqx_modules/src/emqx_modules_schema.erl
@@ -51,17 +51,17 @@ fields("rewrite") ->
         {action,
             sc(
                 hoconsc:enum([subscribe, publish, all]),
-                #{desc => ?DESC(tr_action), example => publish}
+                #{required => true, desc => ?DESC(tr_action), example => publish}
             )},
         {source_topic,
             sc(
                 binary(),
-                #{desc => ?DESC(tr_source_topic), example => "x/#"}
+                #{required => true, desc => ?DESC(tr_source_topic), example => "x/#"}
             )},
         {dest_topic,
             sc(
                 binary(),
-                #{desc => ?DESC(tr_dest_topic), example => "z/y/$1"}
+                #{required => true, desc => ?DESC(tr_dest_topic), example => "z/y/$1"}
             )},
         {re, fun regular_expression/1}
     ];
@@ -80,6 +80,7 @@ desc(_) ->
     undefined.
 
 regular_expression(type) -> binary();
+regular_expression(required) -> true;
 regular_expression(desc) -> ?DESC(tr_re);
 regular_expression(example) -> "^x/y/(.+)$";
 regular_expression(validator) -> fun is_re/1;