diff --git a/Gemfile b/Gemfile
index b2b01de..519e78c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,4 @@
+# -*- mode: yaml; -*-
 source 'https://rubygems.org'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'