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Recently, Onari and Kontani submitted a paper [arXiv:1105.6233] whichcriticizes our recent theoretical study [arXiv:1103.0586] on the neutronscattering experiment as a probe for determining the superconducting gap in theiron pnictides. In their paper, Onari and Kontani have developed a formalism inwhich the imaginary part of the dynamical spin susceptibility(Im$\chi_s(\Vec{q},\omega)$) in the superconducting state can be moreaccurately calculated especially in the $\omega<2\Delta$ regime, where $\Delta$is the superconducting gap. In section IIIC of their paper, they mention thatthe conclusions of our paper are "incorrect based on inaccurate numericalcalculation". In the present Comment, we show that this in fact is not correct.

Comment on arXiv:1105.6233 entitled "Neutron-Inelastic-Scattering Peak  by Dissipationless Mechanism in the s++-wave State in Iron-based  Superconductors" by S. Onari and H. Kontani