diff --git a/README.md b/README.md
index fba1edb..82f662d 100644
--- a/README.md
+++ b/README.md
@@ -30,4 +30,7 @@ ufw delete 2
 ufw allow from 192.168.1.10 to any port 22 proto tcp
 ufw allow in on tailscal0 to interfaceip port 22 from otherdeviceip
 ufw reset
-```
\ No newline at end of file
+```
+
+## List ports Linux is listening on
+`sudo lsof -nP -iTCP -sTCP:LISTEN`
\ No newline at end of file