diff --git a/udp2raw-openvpn-config-guide.md b/udp2raw-openvpn-config-guide.md
index 3852b59..5ac6292 100644
--- a/udp2raw-openvpn-config-guide.md
+++ b/udp2raw-openvpn-config-guide.md
@@ -92,3 +92,6 @@ sndbuf 2000000      ##### important
 rcvbuf 2000000      ##### important
 txqueuelen 4000     ##### suggested
 ```
+
+# see also
+https://github.com/wangyu-/UDPspeeder/wiki/UDPspeeder-openvpn-config-guide
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