diff --git a/docs/gluetun.md b/docs/gluetun.md
index db0c3d6..c716368 100644
--- a/docs/gluetun.md
+++ b/docs/gluetun.md
@@ -111,6 +111,8 @@ Write a script named `restartvpn.sh` and add this content to it:
 Note: `2>&1` sent STDERR to STDOUT, `tee /path/to/restartvpn.log` will write the output of the script to /path/to/restartvpn.log (in the current directory) (while still printing it to the shell)
 
 ```bash
+#!/usr/bin/env bash
+
 echo "BEGIN $(date --rfc-3339=seconds)" 2>&1 | tee /path/to/restartvpn.log
 
 curl -X GET "http://127.0.0.1:8000/v1/publicip/ip" 2>&1 | tee /path/to/restartvpn.log # Print the original IP