diff --git a/colorls.rb b/colorls.rb
old mode 100644
new mode 100755
index d5687db..f257246
--- a/colorls.rb
+++ b/colorls.rb
@@ -1,3 +1,5 @@
+#!/usr/bin/env ruby
+
 require 'colorize'
 require 'yaml'
 require 'facets'