OK, so that's great progress for now. We can now add todo items to our app, and the state of the data is tracked using our service. Next we'll move on to getting our footer functionality working, including the todo counter, and look at conditional rendering, including correctly styling todos when they've been checked. We'll also wire up our "Clear completed" button....placeholder alert(text); line can be replaced with a call to our new add()...add() function. Replace it with the following: js this.todos.add(text);...