The model proposed by Gatos and Lavine [H. C. Gatos and M. C. Lavine, J. Electrochem. Soc.107, 427 (1960)] for the dangling bonds of III–V compounds is discussed in the context of the available experimental facts and the objection advanced by Holt [D. B. Holt, J. Appl. Phys.31, 2231 (1960)]. It is shown that the model as originally proposed is consistent with basic principles and experimental observations.