Watch resume event on cordova using ionic framework

I'm trying to watch the resume event when the app resumes. I used to have this working but ionic changed things up and now I'm having trouble. I'm sure it's an easy fix.

This used to work but no longer does:

$ionicPlatform.on('resume', function(){
    //rock on
});

The docs now suggest using the following but I'm not sure which DOM element to use.

angular.module('starter', ['ionic', 'starter.controllers'])
.run(function() {
    ionic.Platform.ready(function() {
        ionic.on('resume', function(){
            //rock on
        }, element);
    });
});

Also, should the ionic.on() function be in the ionic.Platform.ready() function?

Ok, answered my own question.

It didn't change. I was wrong. The following works.

angular.module('starter', ['ionic', 'starter.controllers'])
.run(function($ionicPlatform) {
    $ionicPlatform.ready(function() {
        // ready
    });
    $ionicPlatform.on('resume', function(){
        // rock on
    });
});

It is unclear in the docs though. It says here

$ionicPlatform An angular abstraction of ionic.Platform.

so the following should work but it doesn't:

ionic.Platform.on('resume', function(){
    // rock on
});