diff --git a/udp2raw-openvpn-config-guide.md b/udp2raw-openvpn-config-guide.md
index c82653d..928ecd6 100644
--- a/udp2raw-openvpn-config-guide.md
+++ b/udp2raw-openvpn-config-guide.md
@@ -100,4 +100,7 @@ txqueuelen 4000     ##### suggested
 # to transparently redirect traffic
 Check this article,its same for udp2raw+OpenVPN :
 
-https://github.com/wangyu-/UDPspeeder/wiki/UDPspeeder-openvpn-config-guide
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+https://github.com/wangyu-/UDPspeeder/wiki/UDPspeeder-openvpn-config-guide
+
+#### Note
+If you want to transparently redirect traffic by VPN, it's very important to add a route exception (on client side) so that the VPN won't hijack udp2raw's traffic. Since your VPN traffic goes throught udp2raw, if your VPN hijacks udp2raw's traffic then there will be a traffic loop and your udp2raw will lost connection.
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