The assertions about the congruence properties of the coefficients Ci, Di, in formula (3) of the paper (Mathematika, 16 (1969), 101–105) referred to above are patently false. They are, moreover, irrelevant, though the succeeding argument is so condensed and badly expressed that the true and the false in the paper cannot easily be distinguished. In short, the paper ought to be re-written. My thanks are due to the critic who first complained of the mistakes to the Editors and who thereby took upon himself the arduous task of refereeing this Corrigendum. His patient criticisms led to many improvements of the arguments alluded to in my paper, as well as of those which are presented here, and I am most grateful to him for his help.