Tex. Code of Criminal Procedure § 21.14

(a) An indictment for perjury or aggravated perjury need not charge the precise language of the false statement, but may state the substance of the same, and no such indictment shall be held insufficient on account of any variance which does not affect the subject matter or general import of such false statement; and it is not necessary in such indictment to set forth the pleadings, records or proceeding with which the false statement is connected, nor the commission or authority of the court or person before whom the false statement was made; but it is sufficient to state the name of the court or public servant by whom the oath was administered with the allegation of the falsity of the matter on which the perjury or aggravated perjury is assigned.

(b) If an individual is charged with aggravated perjury before a grand jury, the indictment may not be entered by the grand jury before which the false statement was alleged to have been made.