Update by author would be certainly better as it will throw the latest information what author believes in the light of his/her new knowledge. It will help wherever people are looking for information.

An alternative way is for the seeker to ask/msg the author about more information that he/she has gained till date and provide other insights in the problem as well. It would be interesting that seeker/author updates the knowledge in node in question or/and add in some other form such as QA. Thus know-how here would help to solve the problem rather than just being a piece of knowledge and monastery would be enriched.

I certainly like the idea of open-source know-how, mentioned by tjh.

artist