diff --git a/Graceful-shutdown-and-restart.md b/Graceful-shutdown-and-restart.md
index cabb160..461e8a2 100644
--- a/Graceful-shutdown-and-restart.md
+++ b/Graceful-shutdown-and-restart.md
@@ -4,4 +4,6 @@ You can send `SIGQUIT` to sslocal or ssserver process. The process closes listen
 
 If you are using workers, send `SIGQUIT` to master process.
 
-On Windows, please use `SIGTERM` instead.
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+On Windows, please use `SIGTERM` instead.
+
+Notice: only [some versions](https://github.com/clowwindy/shadowsocks/wiki/Feature-Comparison-across-Different-Versions) support this feature.
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