Tex. R. Civ. P. 810
The petition in actions authorized by Section 17.003, Civil Practice and Remedies Code, shall state the real names of the plaintiff and defendant, and shall describe the property involved with sufficient certainty to identify the same, the interest which the plaintiff claims, and such proceedings shall be had in such action as may be necessary to fully settle and determine the question of right or title in and to said property between the parties to said suit, and to decree the title or right of the party entitled thereto; and the court may issue the appropriate order to carry such decree, judgment or order into effect; and whenever such petition has been duly filed and citation thereon has been duly served by publication as required by Rules 114 -116, the plaintiff may, at any time prior to entering the decree by leave of court first had and obtained, file amended and supplemental pleadings that do not subject additional property to said suit without the necessity of reciting the defendants so cited as aforesaid.
Tex. R. Civ. P. 810