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

@@ -27,10 +27,11 @@ Do this through the dashboard web UI or via the shell on apps-test.awesim.org.
 +gem 'rails', '4.1.15'  # Use the latest patch version
 ```
 
-Follow the update guides for updating Rails:
+* **TODO: what happens if we run `bin/rake rails:update`**
+
+For details, see:
 
 * http://guides.rubyonrails.org/upgrading_ruby_on_rails.html#upgrading-from-rails-4-0-to-rails-4-1
-* http://guides.rubyonrails.org/upgrading_ruby_on_rails.html#upgrading-from-rails-4-1-to-rails-4-2
 
 ##### Update `sass-rails`