Here's the announcement that cross-platform multiplayer support is now in Rocket League, allowing Windows and Xbox One gamers to compete alongside each other in the motorized sports game, which they say is a first. Here's the announcement, which is from yesterday, so everything is now live:

As we promised in March, cross-network play for the Xbox One and Steam PC versions of Rocket League will officially roll-out later this afternoon by 3pm PT/ 6pm ET/ 10pm UTC, making it the first-ever Xbox One game to support cross-network play with a Steam PC game.

Nearly 2 million Xbox One players have already competed in Rocket League since we launched in February 2016, but with today’s new cross-network update, your potential pool of teammates and opponents will grow even larger!

It’s an historic moment for us here at Psyonix[psyonix.com], and we’re really excited to bring Xbox One and Steam PC players closer together. Cross-network play has been something that Xbox One gamers have been asking us for since the day we launched, and thanks to Microsoft’s new cross-network policies, we’re proud to give it to them.

Enjoy the new feature — and remember — you can toggle cross-network play on or off with an easy-to-find check box in the Options menu (see a preview below). Have fun!