Unable to catch event emitted from child component in Angular 4

I am sorry for my newbie question, I am trying to emit an event from a child to a parent component using an @Output EventEmitter. I am unable to catch the event in my parent component.

Child Component

@Component({
  selector: 'app-new-attachment',
  templateUrl: './new-attachment.component.html',
  styleUrls: ['./new-attachment.component.css']
})
class NewAttachmentComponent {
  @Input('attachment') attachment: any;
  @Output() doneEditingAttachment:EventEmitter<boolean> = new EventEmitter<boolean>();

  submit() {
    console.log('done editing child');
    this.doneEditingAttachment.emit(true);
  }
}

Parent Component

@Component({
  selector: 'app-new-article',
  templateUrl: './new-article.component.html',
  styleUrls: ['./new-article.component.css']
})
class NewArticleComponent {
   newAttachment: any = {};
   doneEditingAttachment($event) {
     console.log('done editing parent ', $event);
   }
}

I expected to have

done editing child

And a

done editing parent

But I only got done editing child

You need to actually have a binding to the event of the child using the (eventName) notation:

<app-new-attachment [attachment]="newAttachment" (doneEditingAttachment)="doneEditingAttachment($event)"></app-new-attachment>