README.md in grape_fast_jsonapi-0.2.0 vs README.md in grape_fast_jsonapi-0.2.1

@@ -15,11 +15,12 @@
 
 ### Tell your API to use Grape::Formatter::FastJsonapi
 
 ```ruby
 class API < Grape::API
-  format :json
+  content_type :jsonapi, "application/vnd.api+json"
   formatter :json, Grape::Formatter::FastJsonapi
+  formatter :jsonapi, Grape::Formatter::FastJsonapi
 end
 ```
 
 ### Use `render` to specify JSONAPI options