diff --git a/data/autostart.sh b/data/autostart.sh
index b0f421da..f8b804c6 100644
--- a/data/autostart.sh
+++ b/data/autostart.sh
@@ -1,4 +1,5 @@
-#!/bin/sh
+# This shell script is run before Openbox launches.
+# Environment variables set here are passed to the Openbox session.
 
 # Set a background color
 BG=""