The fast expansion of Waymo’s driverless car service is growing competition for Uber. The companies are also partners.

Uber is one step closer to letting customers hail a self-driving vehicle in Austin, Texas, through its app. The company on Wednesday opened up its interest list so that curious riders can declare their interest in potentially being matched with a Waymo robotaxi,

With the Uber and Waymo robotaxi launch next month, users in Austin can sign up now for priority access to the new AVs.