diff --git a/readme-zh.md b/readme-zh.md
index 6fecf08..02443e0 100644
--- a/readme-zh.md
+++ b/readme-zh.md
@@ -262,6 +262,8 @@ Kook 消息的格式化文本。占位符与上文同理，所有的服务器名
 
 该功能为双向转发，即 MC 内消息会发送到指定 QQ 群，QQ 群内消息将被转发到 MC 内。
 
+目前仅支持反向 WebSocket，消息格式仅支持 [array](https://github.com/botuniverse/onebot-11/tree/master/message#readme)。
+
 #### enable
 
 默认值：`false`
diff --git a/readme.md b/readme.md
index 005af7a..1046d30 100644
--- a/readme.md
+++ b/readme.md
@@ -298,6 +298,8 @@ Websocket resource location.
 
 QQ message format sages. Placeholders are defined same as Miencraft, all server name will auto translate to plain format, you do not have to use plain placeholders.
 
+Note that only reverse WebSocket is supported, and message format only supports [array](https://github.com/botuniverse/onebot-11/tree/master/message#readme).
+
 #### chat
 
 Default: `[{server}] <{name}>: {message}`