diff --git a/Notes-on-encryption.md b/Notes-on-encryption.md
index e040f2b..d1cf8e1 100644
--- a/Notes-on-encryption.md
+++ b/Notes-on-encryption.md
@@ -24,5 +24,8 @@ To prevent replay a whole connection, udp2raw client and server will challenge e
 
 To prevent replay the packets inside a connection,  udp2raw packages are sequenced and an anti-replay-widnows is used to filter duplicated packets. 
 
+### Others
 
+###### why not mentioning wireguard in this article
+WireGuard is a more modern VPN compared to openvpn, it's indeed worth mentioning. The reason I only mentioned openvpn in this article is that I haven't look into the protocol of wireguard yet. I am not sure, but I think what I said for openvpn also applies to wireguard.