[Looking at this answer](https://electronics.stackexchange.com/a/52861/11861) it is substantially correct i.e the answer clearly says "perfect", which a beginner may not understand, and the edit adds in details on speed of propagation which enhances the answer and is a correct edit.

When I first saw the edit I almost rejected it as being such a major addition. But I realized that the edit did help, so I accepted it.

However, this raises the question, how best to edit/change/add material to a correct answer but with more nuance?

My gut feeling is that a second answer which refers to the first answer would have been preferable as a refinement.

What say ye?