Found this on the T&C page.. this is a nice thing..
Double Stay Credit: For eligible Any Weekend, Anywhere stays as outlined above, of at least 2 nights, and booked through Hilton Worldwide direct booking channels with valid HHonors membership number, HHonors members will receive a Double Stay Credit, which will count toward tier status only. No Bonus Points will be given. Offer not valid if other HHonors stay credit offer applies. Hilton HHonors™ membership, earning of Points & Miles™ and redemption of Points are subject to HHonors Terms and Conditions.