Tex. 4th. Ct. App. L. R. 8.5

As amended through August 27, 2024
Rule 8.5 - Post-Submission Briefs
(a) Requested by the Court. If the Court requests a post-submission brief, the brief must be filed at the time indicated by the Court; or, if no time is specified, within ten days after the Court's request. An opposing party's reply to a post-submission brief requested by the Court must be filed no later than ten days after the date of the brief requested by the Court. If an additional post-submission brief is requested by the Court, the aggregate page limits contained in the Texas Rules of Appellate Procedure do not apply.
(b) Not Requested by the Court. If a party wishes to file a post-submission brief that has not been requested by the Court, the party must obtain the Court's permission.

Tex. 4th. Ct. App. L. R. 8.5

Notes & Comments: Citations should use jump cites or pinpoint cites and should conform to the most recent editions of Harvard L. Rev., A Uniform System of Citation (the Bluebook), and Tex. L. Rev., Texas Rules of Form (the Greenbook). The Court encourages the use of appendices, especially for federal authorities not found in its own library. The reporter's record may be referred to as "RR" and the clerk's record as "CR." As a general rule, the Court will not give permission to file a brief containing additional issues or points of error after a case has been submitted to the Court for decision. The Court interprets the term "amended brief" to mean a brief that completely replaces the original brief. Pursuant to administrative order of the Court, the Clerk of the Court is authorized to attest to per curiam orders granting extensions of time to file briefs. The Court generally grants a requested extension of time to file a brief, up to 60 days from the original due date. Additional time may be granted at the Court's discretion. An appellant who is also in the position of appellee may request permission to file a combination brief.