README.md in jsonapi-serializers-0.14.0 vs README.md in jsonapi-serializers-0.15.0

@@ -16,10 +16,11 @@
   * [Null handling](#null-handling)
   * [Multiple attributes](#multiple-attributes)
   * [Custom attributes](#custom-attributes)
   * [More customizations](#more-customizations)
   * [Base URL](#base-url)
+  * [Root jsonapi object](#root-jsonapi-object)
   * [Root metadata](#root-metadata)
   * [Root links](#root-links)
   * [Root errors](#root-errors)
   * [Explicit serializer discovery](#explicit-serializer-discovery)
   * [Namespace serializers](#namespace-serializers)
@@ -228,10 +229,16 @@
 def base_url
   @base_url
 end
 ```
 ```ruby
+# Override this to provide a resource-object jsonapi object containing the version in use.
+# http://jsonapi.org/format/#document-jsonapi-object
+def jsonapi
+end
+```
+```ruby
 def self_link
   "#{base_url}/#{type}/#{id}"
 end
 ```
 ```ruby
@@ -308,9 +315,17 @@
 ```ruby
 JSONAPI::Serializer.serialize(post, base_url: 'http://example.com')
 ```
 
 Note: if you override `self_link` in your serializer and leave out `base_url`, it will not be included.
+
+### Root 'jsonapi' object
+
+You can pass a `jsonapi` argument to specify a [top-level "jsonapi" key](http://jsonapi.org/format/#document-jsonapi-object) containing the version of JSON:API in use:
+
+```ruby
+JSONAPI::Serializer.serialize(post, jsonapi: {version: '1.0'})
+```
 
 ### Root metadata
 
 You can pass a `meta` argument to specify top-level metadata: