Trying to make some extra money with your new Tesla? Read the fine print first.

Tesla is banning its customers from using their Model X or Model S electric cars — now equipped with the hardware to allow full autonomous driving at some point in the future — as Uber drivers. Customers can drive their cars for a ride-sharing service like they would with any other vehicle, but can't use the cars' antonomous features to have them pick up passengers on their own.

The restriction was buried in the fine print under a section describing the cars' "full self-driving capability," as pointed out by Ars Technica.

The restriction reads:

Please note also that using a self-driving Tesla for car sharing and ride hailing for friends and family is fine, but doing so for revenue purposes will only be permissible on the Tesla Network, details of which will be released next year.

So while you can't sign your Tesla up as an Uber or Lyft driver for now, you can buy one and wait around until the Tesla Network, Tesla's own ride-sharing option, debuts.

The new rule highlights the inevitable competition between Tesla and other ride-hailing companies. Uber is working on its own self-driving cars that could eventually replace the company's drivers. The company's driverless vehicles hit the road in Pittsburgh for a test program in September.

Tesla announced that all its cars would be able to be fully autonomous at an event Wednesday night.