diff --git a/Optimizing-Shadowsocks.md b/Optimizing-Shadowsocks.md
index bdf8c0f..c6a3ecf 100644
--- a/Optimizing-Shadowsocks.md
+++ b/Optimizing-Shadowsocks.md
@@ -27,7 +27,7 @@ net.ipv4.tcp_congestion_control = hybla
 
 Then:
 
-    sysctl -p
+    sysctl --system
 
 Warning: **DO NOT ENABLE `net.ipv4.tcp_tw_recycle`!!!** See [this article](http://vincent.bernat.im/en/blog/2014-tcp-time-wait-state-linux.html).