Tex. Educ. Code § 132.122

In any class action permitted under this chapter, the court shall direct the defendant to serve on each member of the class the best possible notice. If required in the interest of justice, the court may direct that individual notice be served on all members of the class who can be identified through reasonable efforts. Such notice shall inform the recipient that the recipient is thought to be a member of the class and, if so, the recipient may enter an appearance and join in the suit, either in person or through counsel.