diff --git a/update.sh b/update.sh
index 6e74a87..2738b0d 100755
--- a/update.sh
+++ b/update.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/sh
+
 git fetch --all
 git checkout upstream/master lua/highlite.lua
 mv lua/highlite.lua $(find lua -type f -not -name 'highlite.lua')