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Bragg diffraction is comparable to a hard-wall reflection if the Braggcondition is exactly fulfilled. However, in a neutron interferometer in thegravitational field (COW experiment) this is not the case and the momentumtransfers should not be described by hard wall reflection, as it has been donein the commented article. Instead, and quite similar to the atom case, eachmirror or beam splitter creates a constant momentum transfer given by thereciprocal lattice vector of the Bragg crystal. To lowest order there are nodifferences between the atom and the neutron case.

Comment on "Relativistic effects in atom and neutron interferometry and the differences between them" by Greenberger, Schleich and Rasel