I answered a question recently and then realized I needed to add material to provide a full answer, which I did. (I did this after the answer had received an upvote. I don't know if that's an issue.) I marked the new material with the heading "Edit" as I have seen elsewhere.
Now that I have thought about the question and my answer even more, I would like to completely rewrite my answer in order to both generalize and clarify. Is that okay? If not, what are the alternatives?