diff --git a/plugins/wechat_cpn/internal/wechat_cpn.go b/plugins/wechat_cpn/internal/wechat_cpn.go
index 85d2d2e..5fccdc6 100644
--- a/plugins/wechat_cpn/internal/wechat_cpn.go
+++ b/plugins/wechat_cpn/internal/wechat_cpn.go
@@ -9,6 +9,7 @@ import (
 )
 
 // 插件通信信息,若不对应则会报错panic
+// 微信立减金文档地址： https://pay.weixin.qq.com/doc/v3/merchant/4012463767
 const (
 	Tag         = "wechat_cpn"
 	Version     = 1