As you can see in [angular-ui-router.js](https://github.com/angular-ui/ui-router/blob/805e69bae319e922e4d3265b7ef565058aaff850/release/angular-ui-router.js#L10), `module.exports` is being used to define the module name for angular. Setting the format here allows for the following. ```js import angular from 'angular'; import uiRouter from 'angular-ui-router' angular.module('app', [uiRouter]); ```