Tex. Fin. Code § 303.102

The applicable rate ceiling for an open-end account agreement that provides for a variable rate or amount according to an index, formula, or provision of law disclosed to the obligor, other than a variable rate commercial contract that is subject to Section 303.004, is the annualized, quarterly, or weekly ceiling as disclosed to the obligor. The annualized ceiling shall be adjusted after each 12-month period, the quarterly ceiling shall be adjusted after each three-month period, and the weekly ceiling shall be adjusted weekly.