diff --git a/doc/udpspeeder_openvpn.md b/doc/udpspeeder_openvpn.md
index a59a259..15e8b65 100644
--- a/doc/udpspeeder_openvpn.md
+++ b/doc/udpspeeder_openvpn.md
@@ -99,3 +99,4 @@ or
 ```
 ip route add 44.55.66.77 dev XXX
 ```
+(run at client side)