Just got served this ad on Facebook, sorry if it was already posted elsewhere but searched and didn't see it.
Here's how it works:
1. Register for this cardmember-only promotion by June 30, 2017.
2. Redeem your points for free nights, Points + Cash stays or toward room upgrades, dining and spa services completed between June 1 and September 5, 2017.
3. You’ll get 10% of your redeemed points back as Bonus Points. They’ll automatically be deposited into your World of Hyatt account after your points have been used.
https://world.hyatt.com/content/gp/en/chaseredemption.html