diff --git a/Configure-Shadowsocks-with-Supervisor.md b/Configure-Shadowsocks-with-Supervisor.md
index 915021c..e69b025 100644
--- a/Configure-Shadowsocks-with-Supervisor.md
+++ b/Configure-Shadowsocks-with-Supervisor.md
@@ -15,6 +15,7 @@ Edit `/etc/shadowsocks.json`
 
 Run
 ```
+apt-get update
 apt-get install python-pip python-m2crypto python-gevent supervisor
 pip install shadowsocks superlance
 ```