This is an action by two real estate brokers, Haggart and Owens, to recover a 6% commission from Mr. and Mrs. Whitefield for having found a purchaser for a 10-acre tract owned by the Whitefields. The defendants’ answer to the complaint was a general denial. Upon trial the jury awarded the plaintiffs $1,050, which was just half the amount of their commission. There are several points for reversal, plus a cross appeal, but we affirm the trial court’s judgment in its entirety.
In 1978 the Whitefields orally employed the brokers to find a purchaser for the ten acres, for $35,000. The brokers produced Phyllis Ann McKenzie, who signed a printed form of Offer and Acceptance on December 28. The description the brokers inserted in the form was indefinite: “10 acres more or less . . . owned by Whitefield. Legal to be attached.” There has, however, never been the slightest question about what 10-acre tract was involved. In fact, Whitefield himself, *435called as a witness by the plaintiffs, testified that he owned no other land at the time. On January 2, 1979, the White-fields accepted Mrs. McKenzie’s offer by signing the Offer and Acceptance, which included this sentence just above the Whitefields’ signatures: “We agree to pay the below named agent a fee of 6% for professional services rendered in securing said offer.” Haggart signed below.
After the signing of the Offer and Acceptance, negotiations looking to the final closing of the sale were conducted by Charles Morgan as attorney for the buyer and by Whitefield’s sister Carolyn as attorney for the sellers. Difficulties arose about the manner of financing the sale, even though the Offer and Acceptance had stated explicitly that the buyer would pay #8,000 in cash and the sellers would carry the balance of #27,000 at 8Vi% interest with specified monthly payments for 15 years, the sellers giving a deed and the purchaser executing a note and deed of trust. The problem seems to have been that the Offer and Acceptance recited that the sellers would furnish title insurance, but the property was actually subject to an outstanding mortgage of about #16,000, payable in installments. That refinancing problem was evidently the responsibility of the sellers, not of the buyer nor of the brokers.
Finally, on January 31, 1979, just before the intended transfer of possession, Miss Whitefield wrote Morgan that “the purported contract ... is in fact not a contract,” that there would be no transfer of any property to the buyer, and that “Mr. Whitefield does not desire to sell any property at this time.” This suit by the brokers followed, with the record indicating that Mrs. McKenzie also brought suit for specific performance.
We consider first the Whitefields’ argument that the jury should have been instructed in substance that the Offer and Acceptance was void because of the indefinite description of the land. That may or may not have been true as between the sellers and their buyer, but the invalidity of the contract is not material to the brokers’ right to recover their commission. In the first place, the Whitefields signed a contract reciting that a legal description would be attached. *436Whitefield admitted that he had the correct description, which was by metes and bounds. During the negotiations, however, his sister refused to supply the description. Obviously one who employs a broker to sell his land must furnish a legal description; so the omission was not that of the brokers.
In the second place, the brokers would be entitled to their commission even if the description had been bad and the Whitefields had refused to sign the Offer and Acceptance for that reason. A broker’s contract is not within the statute of frauds and need not be in writing. Walthour v. Finley, 237 Ark. 106, 372 S.W. 2d 390 (1963). It is immaterial that the principals do not sign the contract of sale, because the broker earns his commission by producing a purchaser ready, willing and able to take the property on the seller’s terms, even though no enforceable contract of sale is executed. Fike v. Newlin, 225 Ark. 369, 282 S.W. 2d 604 (1955); Reeder v. Epps, 112 Ark. 566, 166 S.W. 747 (1914); Moore v. Irwin, 89 Ark. 289, 116 S.W. 662, 20 L.R.A. (n.s.) 1168, 131 Am. St. Rep. 97 (1909)- Thus there was no occasion for the trial judge to instruct the jury about the validity of the Offer and Acceptance.
Next, the Whitefields argue there is no substantial evidence to support the jury’s finding that the brokers produced a purchaser ready, willing and able to buy the property. It was, however, not necessary for Mrs. McKenzie to tender complete performance, because the sellers put themselves in default when they reneged on their promise by notifying the buyer’s attorney that they did not desire to sell the property. In that situation it was enough for the buyer to indicate her willingness to perform in case of the sellers’ concurrent performance. Loveless v. Diehl, 236 Ark. 129, 364 S.W. 2d 317 (1963). That concurrent performance was never tendered by the Whitefields; to the contrary, they repudiated their obligation.
The proof of Mrs. McKenzie’s being ready, willing and able to buy was clearly sufficient to go to the jury. It is undisputed that she signed the Offer and Acceptance and put up #500 as earnest money. She retained Morgan as her *437attorney, who worked toward the completion of the sale until Miss Whitefieid abruptly ended the negotiations. The day before that Morgan had written her that Mrs. McKenzie had the $8,000 down payment on deposit. Broker Owens, who was in contact with Mrs. McKenzie, testified that not only was she ready, willing and able to purchase. “She wanted the property as soon as she could get it.” We need not decide whether broker Haggart’s similar testimony was admissible, because at most its admission into evidence was cumulative and harmless error. In short, the plaintiffs made a strong prima facie case on this point, but the Whitefields offered not one word of proof to question Mrs. McKenzie’s readiness, willingness, or ability to buy. Quite the opposite, their acceptance of Mrs. McKenzie’s offer, without questioning her ability to purchase, indicated their satisfaction on that point. Sarna v. Fairweather, 248 Ark. 742, 746, 453 S.W. 2d 715 (1970).
We need not discuss in detail the Whitefield’s arguments about special interrogatories to the jury, a device not extensively used in Arkansas. Both brokers testified that they were licensed as such in Arkansas. There was no dispute about that fact. Even so, the Whitefields insist it was reversible error for the trial judge to refuse to submit an interrogatory requiring the jury to determine whether the plaintiffs were licensed real estate brokers. The far-fetched argument is that the brokers were parties to the action; so their testimony is not regarded as undisputed. The short answer to this argument is that if by some blunder the jury had found that the plaintiffs were not licensed, the trial judge would have been required to set aside the verdict as being against the preponderance of the evidence. Thus the interrogatory would necessarily have been futile.
On cross appeal the brokers argue that upon the undisputed testimony they were entitled to recover the full amount of their commission; so we should increase the judgment to $2,100. That same argument about a jury verdict was rejected in Fulbright v. Phipps, 176 Ark. 356, 3 S.W. 2d 49 (1928), a case that has been followed many times. We do, however, sustain the appellees’ request for an allowance of $417.35 for the cost of their supplemental abstract, which *438we find to have been necessary. That amount will be taxed as additional costs.
Affirmed.
Holt, J., not participating.
Adkisson, C.J., concurs.