Tex. Business Organizations Code § 21.732

(a) In addition to a matter required or authorized by law to be stated on a certificate representing shares, each certificate representing shares issued by a close corporation must conspicuously state on the front or back of the certificate: "These shares are issued by a close corporation as defined by the Texas Business Organizations Code. Under Chapter 21 of that code, a shareholders' agreement may provide for management of a close corporation by the shareholders or in other ways different from an ordinary corporation. This may subject the holder of this certificate to certain obligations and liabilities not otherwise imposed on shareholders of an ordinary corporation. On a sale or transfer of these shares, the transferor is required to deliver to the transferee a complete copy of any shareholders' agreement."

(b) Notwithstanding this chapter and Section 3.202, the status of a corporation as a close corporation is not affected by the failure of a share certificate to contain the statement required by Subsection (a).