Should you add things to your to-do list you've already done, just to cross them off?

I am a fan, to some extent, of to-do lists. I know of people who add things they've already done, so they can cross them off. Somehow I just can't wrap my arms around it though.

Do you do this? Does it really help?

At the end of the day, add items to your list that weren't there but which you accomplished, just so you can cross them off. "This gives you a sense of productivity," Williams says.

via How to Conquer Your To-Do List CIO.com.