Texas Estates Code - EST § 309.101. Discovery of Additional Property or Claims

(a) If after the filing of the inventory, appraisement, and list of claims the personal representative acquires possession or knowledge of property or claims of the estate not included in the inventory, appraisement, and list of claims the representative shall promptly file with the court clerk a verified, full, and detailed supplemental inventory, appraisement, and list of claims.

(b) If after the filing of the affidavit in lieu of the inventory, appraisement, and list of claims the personal representative acquires possession or knowledge of property or claims of the estate not included in the inventory and appraisement given to the beneficiaries, the representative shall promptly file with the court clerk a supplemental affidavit in lieu of the inventory, appraisement, and list of claims stating that all beneficiaries have received a verified, full, and detailed supplemental inventory and appraisement.