diff --git a/README.md b/README.md
index ad997b9..db82602 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 Download precompiled [Releases](https://github.com/xtaci/kcptun/releases).
 
 ```
-KCP Client: ./client_darwin_amd64 -r "SERVER_IP:4000" -l ":8388" -mode fast2
+KCP Client: ./client_darwin_amd64 -r "KCP_SERVER_IP:4000" -l ":8388" -mode fast2
 KCP Server: ./server_linux_amd64 -t "TARGET_IP:8388" -l ":4000" -mode fast2
 ```
 The above command can establish 8388/tcp port forwarding (through 4000/udp port).