README.md in jsonapi-serializers-1.0.1 vs README.md in jsonapi-serializers-2.0.0.pre.beta.1

@@ -27,10 +27,11 @@
   * [Sparse fieldsets](#sparse-fieldsets)
 * [Relationships](#relationships)
   * [Compound documents and includes](#compound-documents-and-includes)
   * [Relationship path handling](#relationship-path-handling)
   * [Control links and data in relationships](#control-links-and-data-in-relationships)
+* [Instrumentation](#instrumentation)
 * [Rails example](#rails-example)
 * [Sinatra example](#sinatra-example)
 * [Unfinished business](#unfinished-business)
 * [Contributing](#contributing)
 
@@ -637,9 +638,33 @@
        "data": {
          "type": "users",
          "id": "1"
        }
      }
+```
+
+## Instrumentation
+
+Using [ActiveSupport::Notifications](https://api.rubyonrails.org/classes/ActiveSupport/Notifications.html) you can subscribe to key notifications to better understand the performance of your serialization.
+
+The following notifications can be subscribed to:
+
+* `render.jsonapi_serializers.serialize_primary` - time spent serializing a single object
+* `render.jsonapi_serializers.find_recursive_relationships` - time spent finding objects to serialize through relationships
+
+This is an example of how you might subscribe to all events that come from `jsonapi-serializers`.
+
+```ruby
+require 'active_support/notifications'
+
+ActiveSupport::Notifications.subscribe(/^render\.jsonapi_serializers\..*/) do |*args|
+  event = ActiveSupport::Notifications::Event.new(*args)
+
+  puts event.name
+  puts event.time
+  puts event.end
+  puts event.payload
+end
 ```
 
 ## Rails example
 
 ```ruby