diff --git a/src/en/server-hosting/port-forwarding.md b/src/en/server-hosting/port-forwarding.md
index f60948e9c..452e56873 100644
--- a/src/en/server-hosting/port-forwarding.md
+++ b/src/en/server-hosting/port-forwarding.md
@@ -64,6 +64,10 @@ If it succeeds and your server is accessible from the outside world, great! If i
 
 ## Manual Port Forwarding
 
+```admonish info
+Disable UPnP from your config if you are going to do manual port forwarding. It may cause issues.
+```
+
 ```admonish info
 It is extremely common for your ISP to install a router for you. Because of this, "check your router's manual" may instead involve "check your ISP's help site or ask their support".