Comcast has been quietly rolling out monthly data usage caps, along with options for customers to pay their way out of them, and it appears the company is bringing the plan to more locations. As first reported by DSLReports and confirmed to The Verge by Comcast, starting December 1st, customers in parts of Virginia, Tennessee, Arkansas, and Louisiana will have a newly introduced 300GB monthly cap.

The company has said that the pricing structure affects only a fraction of its customers, but even so, it's certain to irk those exceeding the cap, who will now be required to pay $30 for unlimited data or be charged an extra $10 for every 50GB of data over the 300GB limit. (That $30 has fluctuated some in other trial areas — Atlanta is being charged $35.) DSLReports also published an email from Comcast announcing the change.

Comcast says it has been testing the new plan as a trial, but seems to be expanding it to more and more areas. The cities affected by the new change are "Little Rock, Arkansas; Houma, LaPlace and Shreveport, Louisiana; Chattanooga, Greenville, Johnson City/Gray, Tennessee; and Galax, Virginia." Notably, Chattanooga is home to public broadband networks that Comcast has previously, and publicly, fought.

Disclosure: Comcast is an investor in Vox Media, The Verge's parent company.

Update 3:50 PM ET: Includes confirmation from a Comcast spokesperson.