Responder Chain on 10.9 and earlier

In “Consideratuons for OS-X 10.9 and Earlier” it mentions that view controllers aren’t automatically added to the responder chain and then goes on to show an extension to NsViewController to patch the responder chain. It is also mentioned that viewDidLoad method is not available in the earlier operating systems… The example showing how to use the patch method is done inside of viewDidLoad but since it isn’t available on 10.9 isn’t this a mistake? Where would one call the patch method on earlier versions of OS-X?