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It is shown that the method of edge waves (MEW)  (or "physical theory of diffraction") describes the secondary edge waves correctly. Opposing statement found in - results from some misunderstanding. It is noted that both MEW and the geometrical theory of diffraction may predict, at best, only the first two terms in an asymptotic expansion (with k → ∞) of the sum of the edge waves for real three-dimensional bodies. Some formulas dealing with MEW in  are defined more precisely.