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A topic of present interest is the application of experimentally observedquantum mechanical levels of ultra-cold neutrons in the earth's gravitationalfield for searching short-range modifications to gravity. A constraint on newforces in the nanometer-range published by Nesvizhevsky and Protasov followsfrom inadequate modelling of the interaction potential of a neutron with amirror wall. Limits by many orders of magnitude better were already derivedlong ago from the consistency of experiments on the neutron-electroninteraction.Comment: three page

Comment on ‘Constraints on non-Newtonian gravity from the experiment on neutron quantum states in the Earth's gravitational field’