diff --git a/cpi_fetcher.rb b/cpi_fetcher.rb
index 832a2c6..c255a5a 100644
--- a/cpi_fetcher.rb
+++ b/cpi_fetcher.rb
@@ -1,3 +1,5 @@
+#!/usr/bin/env ruby
+
 require 'uri'
 require 'net/http'
 require 'json'