From Exercise 1: Todo model 'order' attribute

// Our basic **Todo** model has `title`, `order`, and `completed` attributes.

In the original model definition for the Todo, this comment states that there will be a title, order, and completed attribute. However we only set the defaults for title, and completed.

And later on in the collection functions, the nextOrder and comparator functions both make use of a .get('order') on the todo object.

Am I missing something? Or does there need to be an order attribute established in the Todo model. If it doesn't need to be established there, then perhaps there should be a note that Todo model WILL have 'title', 'order', and 'completed' attributes, but only title, and completed are defined up front.