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JavaScript AngularJS Extending Inputs Extending Inputs: Optional require

I can't figure this out. Can someone please help me?

Challenge: Add a link function that takes four parameters: $scope, $element, $attrs, and ngModelCtrl. You don't need to add any statements in the function body yet.

app.js
angular.module('treehouseCourse', [])
  .directive('sometimesTwoWay', function() {
    return {
      require: '?ngModel'

    }
  });
index.html
<!DOCTYPE html>
<html ng-app="treehouseCourse">
<head>
  <title>Angular.js</title>
  <script src="js/angular.js"></script>
  <script src="app.js"></script>
</head>
<body>

  <sometimes-two-way ng-model="course.description"></sometimes-two-way>

</body>
</html>

Isn't it simply asking you to do add this code to the app.js?

function link ($scope, $element, $attrs, ngModelCtrl) {};

3 Answers

That's what I thought, but it won't pass.

I have no idea what I'm doing wrong.

I figured it out!

What was the problem? :)

I forgot ''. lol