This question already has an answer here:
When is it reasonable/recommended to add another answer when I have already added one? My doubt comes from this question that I answered although I find later that the question was not complete. I found a way to solve the problem and was going to post it when I got the "add another answer" question.
So, should I post a new answer in this case or edit the somewhat faulty one? Better yet, when is it appropriate to post another answer?