diff --git a/README.md b/README.md
index 85baca54..0369d320 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@ Current version: 1.0.0.1
 
 This is C# version of shadowsocks.
 
+Warning: This C# version is deprecated. Please use [shadowsocks-gui](https://github.com/shadowsocks/shadowsocks-gui) instead.
+
 Other ports and clients can be found [here](https://github.com/clowwindy/shadowsocks/wiki/Ports-and-Clients).
 
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