in reply to
When I change my own node considerably, what's then?
Generally speaking if you update your node to reflect what people have said to you, politeness would dictate that you put
in there to describe your update.
Not only is this polite but it helps those reading the node to understand the context of peoples replies to your node.
For example, there was a typo in this node so I would put:
Update: fixed typo
However, thats purely from a code/opinion point of view. In the context of your example, surely thats what NodeReaper is for?