Tex. Bus. & Com. Code § 51.154
A disclosure statement must:
(2) specify the period during which the seller has sold business opportunities involving the products, equipment, supplies, or services the seller is offering to the purchaser.
Acts 2007, 80th Leg., R.S., Ch. 885 (H.B. 2278), Sec. 2.01, eff. April 1, 2009.