Eric beat me to it :)
Yes it's the regular HTML comment you need. That way you can always easily uncomment it, add a page and then comment it out again before your client notices!! :)
It would be good to have some sort of toggle for this though in a future release of the Solution.
It would alsi be good if the client couldn't edit the two fields top left (not got it open so my memory fails me) The page name and page content area bit. I've had several instances where I've had to repair clients over enthusiasm.
Still that's for the future.