Man, I've been bit a few times with this. I'll read code and think, "Why the hell did they do that?" Later, when I'm almost done re-writing it, I see the edge c

Man, I've been bit a few times with this. I'll read code and think, "Why the hell did they do that?" Later, when I'm almost done re-writing it, I see the edge case they were working around. At the very least, comment these situations.