exception is when good cause is shown why the testimony should be allowed in spite of the discovery sanction. Determination of good cause is within the sound discretion of the trial court. That determination can only be set aside if that discretion was abused. Smithson v. Cessna Aircraft Co., 665 S.W.2d 439, 442 (Tex. 1984).
When the motion to exclude the testimony of Murphy was made, H.E.B. offered to allow Morrow to take Murphy’s deposition prior to his testimony. In addition, H.E.B. argued that Morrow would not be surprised by the testimony of Murphy. The court of appeals in its opinion recites much of the evidence which shows there was no surprise. Lack of surprise would show there was in fact no good cause to exclude the testimony of Murphy, however, this is the inverse of the standard. The testimony was automatically excluded when H.E.B. failed to supplement its answer. It is incumbent upon the party offering the testimony to show good cause why it should be included. As no showing of good cause was made, the trial court did not abuse its discretion. Yeldell v. Holiday Hills Retirement and Nursing Center, Inc., supra.
The judgment of the court of appeals is reversed and the cause is remanded to the court of appeals to consider those factual sufficiency points not reached, consistent with this opinion. Montfort v. Jeter, 567 S.W.2d 498, 500 (Tex. 1978).