Tex. Finance Code § 347.153: REQUIREMENTS FOR AMENDMENT.

(a) Before an amendment of a credit transaction may take effect it must be:

(1) confirmed in writing;

(2) signed by the consumer; and

(3) returned to the creditor.

(b) The writing must state:

(1) the terms of the amendment; and

(2) the new due dates and amounts of the installments.

(c) The creditor shall:

(1) deliver a copy of the writing to the consumer; or

(2) mail a copy of the writing to the consumer's address shown on the credit document.

Acts 1997, 75th Leg., ch. 1008, Sec. 1, eff. Sept. 1, 1997.