OPINION
HEDGES, Justice.Appellants, Teleometrics International, Inc. and Jeffrey A Goforth (jointly “appellants”), appeal a judgment confirming an arbitration award issued in favor of Ernest Jay Hall, Ph.D., appellee. In three points of error, appellants claim that the trial court erred in entering judgment because (1) there was no summary judgment evidence of a binding arbitration agreement between the parties; (2) the award was incomplete and unenforceable; and (3) appellants filed a timely application to vacate the award. We affirm.
FACTS
On April 1,1993, Ernest Jay Hall (“Hall”), Jeffrey Goforth (“Goforth”), and Teleome-trics executed an Integrated Agreement for Sale and Redemption of Stock of Teleome-trics. The Integrated Agreement provided that “[a]ny unresolved disputes arising hereunder, including the construction or application of this Agreement, shall be submitted and settled by arbitration in accordance with the rules of the American Arbitration Association.”
In 1994, Hall brought a claim in arbitration against both Goforth and Teleometrics claiming various breaches of their agreements. Arbitration proceedings were held in June 1994 in accordance with the Integrated Agreement. On August 29, 1994, the arbitrator delivered an award in favor of Hall and against Goforth and Teleometrics jointly and severally in the amount of $1,127,237 plus interest.
Appellants refused to pay Hall within 30 days as required by the award. On September 9, 1994, Hall filed a Petition to Confirm Arbitration Award in district court in Montgomery County which was amended on September 16. On September 29, 1994, Hall filed a motion for clarification with the American Arbitration Association to determine whether the award included certain claims. The arbitrator denied Hall’s motion on October 21, 1994, and notified the parties on October 25, 1994 that he denied the award.
On September 28, 1994, appellants filed a motion to transfer venue under article 235(b) of the Texas General Arbitration Act. Tex. Rev.Civ.StatAnn. art. 235(b) (Vernon 1973). The court granted the motion and transferred the case to Harris County on November 16,1994. Hall filed a Motion to Confirm Arbitration Award and Entry of Judgment under the Texas General Arbitration Act in the 165th District Court of Harris County on November 29,1994. He filed a First Supplemental Petition on January 5, 1995 to reflect that the First Amended Petition, originally filed in Montgomery County and transferred to Harris County, was brought under the Texas General Arbitration Act, not the “American Arbitration Act” as originally pled.
Appellants filed their original answer, a general denial, in Montgomery County on October 3, 1994. On January 8, 1995,“ they filed their first amended answer in Harris County. This pleading represents their first application to vacate the arbitration award under the Texas General Arbitration Act. They also brought a counterclaim for damages and sought injunctive relief. On January 9,1995, appellants filed a second amended answer and counterclaim which duplicated their first amended answer except for deletion of the words “under the Texas General Arbitration Act.”
*191The trial court held a hearing on Hall’s motion to confirm the arbitration award on January 13, 1995. The threshold issue before the court was whether appellants had complied with rules 237 and 238 of the Texas General Arbitration Act, which require that any motion to modify or vacate an arbitration award be made within 90 days after delivery of the award. After consideration of the record and of trial briefs on the issue, the trial court ruled in HaU’s favor and entered judgment on January 23,1995 confirming the award.
UNTIMELY MOTION TO SET ASIDE/VACATE AWARD
In point of error three, appellants argue that the trial court erred in entering judgment on the arbitration award without a hearing because appellants had timely filed a motion in opposition to the entry of judgment and to set aside the award, first under the American [Federal] Arbitration Act, which has a three-month limitations period,1 and alternatively, under the Texas General Arbitration Act, which has a 90-day limitations period.
Appellants’ primary argument at the January 13,1994 hearing, and in their subsequent brief to the court, concerned the 90-day limitations period to file a motion to vacate under article 237 of the Texas General Arbitration Act. It is for the first time on appeal that they claim to have relied on the federal act. Thus, both parties acknowledged by their pleadings and conduct that they were operating under the Texas General Arbitration Statute, not the Federal Arbitration Act.2 Because we have found that the Federal Arbitration Act is not applicable to the facts of this case, it will not be addressed.3
Contrary to appellants’ assertion, the trial court held a hearing on Hall’s motion to confirm the arbitration award on January 13, 1995. At that hearing, the court requested briefing by both parties regarding the 90-day limitations period under the Texas act, and both parties complied with this request. After reviewing the briefs, the trial court ruled in Hall’s favor, thereby implicitly finding that appellants did not timely make their application to vacate the arbitration award.
Appellants argue that they did file their application with the court to vacate the arbitration award in a timely manner. The award was delivered on August 29,1994, and their amended answer embodying a request to vacate the award was filed January 8, 1995. If August 29 is the date on which the 90 days began to rim, then appellants’ application was filed out of time. Appellants’ argue that the 90 days began to run, not on August 29, but on October 25, the day the arbitrator’s denial of Hall’s motion to clarify the award was delivered.
The Texas General Arbitration Act provides that a court may confirm an arbitration award upon application of a party unless grounds are urged for vacating, modifying, or correcting the award within the time limits specified in other articles. Tex.Rev.Civ.Stat. Ann. art. 236 (Vernon 1973). The act also provides that a party may apply to a court to *192vacate an arbitration award if the application is made within 90 days after the delivery of the award. Tex.Rev.Civ.Stat.Ann. art. 237 (Vernon 1973). We agree with Hall that the 90-day period in article 237 is a limitations period after which a party no longer has a right to petition a court to vacate an arbitration award. See Louisiana Nat. Gas Pipeline v. Bludworth Bond Shipyard, Inc., 875 S.W.2d 458, 462 (Tex.App.—Houston [1st Dist.] 1994, writ denied) (under the Texas General Arbitration Act, a party to an arbitration agreement was not entitled to vacation of an amended arbitration award where the suit to vacate was not filed within 90 days of the date the amended findings and the award were delivered).
In this ease, the arbitration award was delivered on August 29, 1994. Appellant filed a Motion for Post-Trial Conference and for Clarification of Award with the arbitrator on September 27, 1994, which was denied on October 21,1995 and mailed to the parties on October 25,1994. Appellant’s filed their first amended answer and counterclaim on January 8, 1995, asking the trial court to deny Hall’s motion to confirm the award and to vacate the award.
Appellants admit that they filed the pleadings to vacate the award in excess of 90 days after the original award was delivered. They argue that their application was timely because the pleadings were filed less than 90 days after the final ruling by the arbitrator. They claim that, under article 232 of the Texas General Arbitration Act, Hall’s motion for post-trial conference and for clarification of award on September 27, 1994 operated to extend the time to file a motion to vacate the award until 90 days after the arbitrator’s ruling on that motion was delivered. We disagree.
Article 232 provides that an application to the arbitrators to modify or correct an award shall be made within 20 days after delivery of the award. We read this language as mandatory, such that arbitrators may not change an award based on an application for modification or correction made outside of that time period. Because Hall’s motion for clarification was made more than 20 days after delivery of the award, the arbitrators could not have changed the award.4 Therefore, Hall’s out of time application could not operate to toll the running of the 90 days until October 25.
Furthermore, there is no authority that the mere filing of a motion to clarify an award extends the limitations period to file a motion to vacate the award. Both the Texas General Arbitration Act and interpretive case law are clear that the 90-day limitation period begins to run from the date of the conclusive award itself. It is true that in Louisiana Natural Gas Pipeline, the appellate court measured the 90-day limit from the date the amended arbitration findings were signed. 875 S.W.2d at 462. In this case, however, because Hall’s motion was denied, there was no modified or corrected award to extend the 90-day limitations period. Therefore, any motion to vacate was due 90 days after the initial, and conclusive, award was delivered.
We overrule point of error three.
Our disposition of point of error three renders consideration of appellants’ other two points of error unnecessary.
We affirm the judgment of the trial court.
. See Federal Arbitration Act, 9 U.S.C.S. § 12 (Law.Co-op.1987).
. Appellants claim that they had no knowledge that Hall was seeking judgment on the award under the Texas General Arbitration Act until he filed his supplemental petition on January 5, 1995. This argument is unpersuasive for three reasons. First, appellants acknowledged that the cause was brought under the Texas General Arbitration Act in their motion to transfer venue, dated November 11, 1994. Second, Hall filed his motion to confirm arbitration award and for entry of judgment on November 29, 1994, specifying that it was pursuant to the Texas General Arbitration Act. Finally, in Defendants’ First Amended Answer and Counterclaim, filed on January 8, 1995, appellants applied to the trial court for an order vacating the arbitration award under the Texas General Arbitration Act. On January 9, 1995, however, they filed their Second Amended Answer and Counterclaim and omitted the words “under the Texas General Arbitration Act.”
.Equally as important, the Federal Arbitration Act applies only to a contracts that involve “commerce among several states.” See Federal (or United States) Arbitration Act, 9 U.S.C.S. § 1 (1987); Shearson Hayden Stone, Inc. v. Liang, 493 F.Supp. 104, 106 (N.D.Ill.1980), aff'd, 653 F.2d 310, 311 (7th Cir.1981). Neither Hall nor appellants have alleged facts involving interstate commerce. Without such a predicate, the Federal Arbitration Act does not apply.
. We believe that an analogy to rule 329b is appropriate. Under that rule, the time to perfect an appeal begins is extended to 90 days if a timely motion for new trial or a timely request for findings of fact and conclusions of law have been filed by any party. TexR.Civ.P. 329b(g).