diff --git a/Graceful-shutdown-and-restart.md b/Graceful-shutdown-and-restart.md
index ef86e14..ce2bad1 100644
--- a/Graceful-shutdown-and-restart.md
+++ b/Graceful-shutdown-and-restart.md
@@ -1,3 +1,3 @@
 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.
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+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.
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