Well, whether you are using comments to "separate code" or not, they should be included, always. Especially if someone else will have to maintain the code down the road. If it's just you and always will be then it's up to you of course. But if you are anything like me, I'm likely to forget what or why I was doing something a couple of days after I do it so comments help.
Oh yes yes.
What do you write codes about?