diff --git a/Graceful-shutdown-and-restart.md b/Graceful-shutdown-and-restart.md
index bce86a2..9cd4f55 100644
--- a/Graceful-shutdown-and-restart.md
+++ b/Graceful-shutdown-and-restart.md
@@ -2,7 +2,7 @@ Shadowsocks supports graceful shutdown like nginx.
 
 You can send `SIGQUIT` to sslocal or ssserver process. The process closes listening sockets but still serves alive connections, allowing you to start a new process on the same port. When all connections on the old process are closed, it will then exit.
 
-If you are using workers, send `SIGQUIT` to master process.
+If you are using workers, send `SIGQUIT` to the master process.
 
 On Windows, please use `SIGTERM` instead.