diff --git a/message/message.go b/message/message.go
index 4e9b6d2..a0b47a4 100644
--- a/message/message.go
+++ b/message/message.go
@@ -184,6 +184,7 @@ type CommonToken struct {
 	MsgType      MsgType  `xml:"MsgType"`
 }
 
+// CDATA  使用该类型,在序列化为 xml 文本时文本会被解析器忽略
 type CDATA string
 
 func (c CDATA) MarshalXML(e *xml.Encoder, start xml.StartElement) error {