Documentation mishap in QUndoFramework

In the Undo Framework Example is a part missing.

In the middle of the page it says:
"undo() removes the item from the scene. We need to update the scene as ...(ask Andreas)"
http://doc.trolltech.com/4.7/tools-undoframework.html

So I gather Andreas was never asked, and nobody has read through the tutorial.
This is the same in Qt Assistant.