Allow stop script to kill a port

README.md

@@ -35,6 +35,18 @@ Stop the background server with:
 ./stop.sh
 ```
 
+To stop a specific running port:
+
+```bash
+./stop.sh 5201
+```
+
+or:
+
+```bash
+PORT=5201 ./stop.sh
+```
+
 If you run the server in the foreground, stop it with `Ctrl+C`.
 
 ## Notes