Dr. Emanuel B. Kaplan wishes to call the attention of the readers of The Journal to the fact that one of the drawings used to illustrate his article Discoid Lateral Meniscus of the Knee Joint contains an error in labeling (J. Bone and Joint Surg., 39-A: 77-87, Jan. 1957). On page 81 in Figure 4, what the artist has labeled Popliteus (sup. segment) should have been labeled Semi-membranosus.