There were many articles posted about it. Here's one of them:
https://steemit.com/steemit/@dragosroua/the-3-most-important-changes-in-hardfork-20
Basically, by upvoting yourself before 15 mins, 25% of your vote will go directly to the reward pool (before the changes, it would be given to you.)
Ahh okay, I was just reading something about it on another post. I'm okay with it going back into the reward pool. I just do it to try and help visibility. Thanks for the heads-up and concern!