README.md in ahoy_email-0.1.2 vs README.md in ahoy_email-0.1.3

@@ -140,9 +140,33 @@
 
 ```ruby
 AhoyEmail.track open: false
 ```
 
+## Events
+
+Subscribe to open and click events. Create an initializer `config/initializers/ahoy_email.rb` with:
+
+```ruby
+class EmailSubscriber
+
+  def open(event)
+    # :message and :controller keys
+    ahoy = event[:controller].ahoy
+    ahoy.track "Email opened", message_id: event[:message].id
+  end
+
+  def click(event)
+    # same keys as above, plus :url
+    ahoy = event[:controller].ahoy
+    ahoy.track "Email clicked", message_id: event[:message].id, url: event[:url]
+  end
+
+end
+
+AhoyEmail.subscribers << EmailSubscriber.new
+```
+
 ## Reference
 
 You can use a `Proc` for any option.
 
 ```ruby