README.md in sass-zero-0.0.56 vs README.md in sass-zero-0.0.57

@@ -68,10 +68,11 @@
 ## Installation
 
 Add this to your application's Gemfile:
 
 ```ruby
-gem 'sass-zero'
+gem "sass-zero"
+gem "autoprefixer-rails"
 ```
 
 ## Usage
 
 Add this line to your application.css: