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

@@ -27,6 +27,14 @@ We will be replacing the `awesim_rails` gem with the `ood_appkit` gem, and updat
 +gem 'bootstrap-sass', '~> 3.3'
 ```
 
+##### Use `require: 'dotenv/rails-now`
+
+OodAppkit requires environment variables to be set before Rails loads. Modify your 'dotenv-rails' gem as follows:
+
+```diff
++gem 'dotenv-rails', '~> 2.1', require: 'dotenv/rails-now'
+```
+
 ##### Update OSC gems
 
 ```diff