diff --git a/README.md b/README.md
index 4099446..b354f73 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,8 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
 - ...  
 
  
-本页是v3.9手册,其他版本手册请点击下面链接查看.  
+本页是v4.0手册,其他版本手册请点击下面链接查看.  
+- [v3.9手册](https://github.com/snail007/goproxy/tree/v3.9)
 - [v3.8手册](https://github.com/snail007/goproxy/tree/v3.8)
 - [v3.6-v3.7手册](https://github.com/snail007/goproxy/tree/v3.6)
 - [v3.5手册](https://github.com/snail007/goproxy/tree/v3.5)