For example, the asker of this question about wallpaper resolutions: What is the default resolution of a wallpaper that fits the homescreen exactly in an Android phone? marked the first answer that was posted as correct. The answer is not correct. In this case what's the most appropriate way to correct this?
I just added the correct answer and left a couple comments. I didn't down vote it because I wanted to give the author of the answer the opportunity to correct his answer. Thoughts?