diff --git a/doc/scripts/pack.sh b/doc/scripts/pack.sh
index 3d5a386..9df5e9a 100755
--- a/doc/scripts/pack.sh
+++ b/doc/scripts/pack.sh
@@ -1,4 +1,6 @@
 #!/bin/sh
+# A script to package release binaries + README.md into zip files.
+# Usage: cd outfly; doc/scripts/pack.sh
 
 set -e