AT&T doesn’t charge users extra to access its fastest 5G networks, but it soon may charge more to let people get priority access to its network during busier times. In an app update published in the iOS App Store on Monday, the company detailed a new add-on feature called “Turbo.”

While the add-on did not appear accessible inside the updated app, a description alongside the update says that you can add “AT&T Turbo” to a line on your account which will “provide uninterrupted network speeds during peak traffic times.” In short, pay more for better access to AT&T’s network when it’s busy.