README.md in lentil-0.5.0 vs README.md in lentil-0.5.1

@@ -13,11 +13,11 @@
 
 Although we are using this gem in production, **this gem should be considered an early release**.
 
 ## Installation
 
-lentil has been tested under Ruby 1.9.3 and 2.1.5. **Ruby 2.2.x is not currently supported.**
+lentil has been tested under Ruby 1.9.3 through 2.2.0.
 
 ### Create a new Rails app with Rails 3.2.x
 
 ```sh
 rails new your_app_name
@@ -212,9 +212,13 @@
 Edit `config/lentil_config.yml` and set `instagram_client_id` to the client ID associated with your Instagram API client.
 
 ```sh
 bundle exec rake image_services:instagram:fetch_by_tag
 ```
+
+## Heroku
+
+Documentation for deploying lentil to Heroku may be found in the [doc directory](doc/heroku.md).
 
 ## License
 
 See MIT-LICENSE