Paying more attention to the comments will help you write better code. I can't tell you how many times I've written what I thought was a perfecty good function or line of code, then gone to write the comment or docstring, and realized a better way to do it, or even just a better name.
We follow this practice at Square and I'm very happy with it. Plus, if somebody forgets punctuation we get to joke, “You missed your period!” which is fun and silly.