Tex. Government Code § 2253.043: NOTICE OF CLAIM FOR UNPAID LABOR OR MATERIAL WHEN WRITTEN AGREEMENT DOES NOT EXIST.

(a) Except as provided by Section 2253.044, if a written agreement does not exist between the payment bond beneficiary and the prime contractor or between the payment bond beneficiary and the subcontractor, the notice for a claim for unpaid bills must contain:

(1) the name of the party for whom the public work labor was performed or to whom the public work material was delivered;

(2) the approximate date of performance or delivery;

(3) a description of the public work labor or material for reasonable identification; and

(4) the amount due.

(b) The payment bond beneficiary must generally itemize the claim and include with it copies of documents, invoices, or orders that reasonably identify:

(1) the public work labor performed or public work material delivered for which the claim is made;

(2) the job; and

(3) the destination of delivery.

Added by Acts 1993, 73rd Leg., ch. 268, Sec. 1, eff. Sept. 1, 1993.