README.md in ember-cli-rails-0.2.3 vs README.md in ember-cli-rails-0.3.0

@@ -49,14 +49,19 @@
 - app - this represents the name of the EmberCLI application.
 
 - path - the path, where your EmberCLI applications is located. The default
   value is the name of your app in the Rails root.
 
+- enable - a lambda that accepts each requests' path. The default value is a
+  lambda that returns `true`.
+
 ```ruby
 EmberCLI.configure do |c|
   c.app :adminpanel # path is "<your-rails-root>/adminpanel"
-  c.app :frontend, path: "/path/to/your/ember-cli-app/on/disk"
+  c.app :frontend,
+    path: "/path/to/your/ember-cli-app/on/disk",
+    enable: -> path { path.starts_with?("/app/") }
 end
 ```
 
 Once you've updated your initializer to taste, you need to install the
 [ember-cli-rails-addon](https://github.com/rondale-sc/ember-cli-rails-addon).
@@ -238,10 +243,10 @@
 }
 ```
 
 ember-cli-rails adds your ember apps' build process to the rails asset compilation process.
 
-Now you should be ready to deploy. 
+Now you should be ready to deploy.
 
 ## Additional Information
 
 When running in the development environment, EmberCLI Rails runs `ember build`
 with the `--output-path` and `--watch` flags on. The `--watch` flag tells