README.md in rails_api_documentation-0.2.2 vs README.md in rails_api_documentation-0.2.3

@@ -26,10 +26,14 @@
 
 ## Usage
 
 To display api documentation on route '/api_doc' you need to:
 
+0. config/application.rb ->
+```ruby
+  require 'rails_api_doc'
+```
 1. config/routes.rb ->
   ```ruby
     mount RailsApiDoc::Engine => '/api_doc'
   ```
 
@@ -53,9 +57,10 @@
       end
       parameter :test, type: String, required: true
 
     end
   ```
+3. go to localhost:3000/api_doc
 
 ## Strong params
 
   You may want to use your defined request api to filter incoming parameters.
   Usually we use something like `params.permit(:name, :age)`, but no more!