Port-an-existing-app-to-OOD.md

@@ -18,7 +18,7 @@ We will be replacing the `awesim_rails` gem with the `ood_appkit` gem, and updat
 
 ```diff
 -gem 'rails', '4.0.0'
-+gem 'rails', '4.1.15'
++gem 'rails', '4.1.15'  # You may also use a newer version
 ```
 
 ##### Update `sass-rails`