diff --git a/apps/emqx/i18n/emqx_schema_i18n.conf b/apps/emqx/i18n/emqx_schema_i18n.conf
index 1d8c100d0..5992f2c5d 100644
--- a/apps/emqx/i18n/emqx_schema_i18n.conf
+++ b/apps/emqx/i18n/emqx_schema_i18n.conf
@@ -808,7 +808,7 @@ In strict mode, invalid utf8 strings in for example client ID, topic name, etc.
     mqtt_response_information {
         desc {
             en: """UTF-8 string, for creating the response topic, for example, if set to <code>reqrsp/</code>, the publisher/subscriber will communicate using the topic prefix <code>reqrsp/</code>.
-To disable this feature, input <code>\"\"</code> in the text box below."""
+To disable this feature, input <code>\"\"</code> in the text box below. Only applicable to MQTT 5.0 clients."""
             zh: """UTF-8 字符串，用于指定返回给客户端的响应主题，如 <code>reqrsp/</code>，此时请求和应答客户端都需要使用 <code>reqrsp/</code> 前缀的主题来完成通讯。
 如希望禁用此功能，请在下方的文字框中输入<code>\"\"</code>；仅适用于 MQTT 5.0 客户端。"""
         }