In a molecular device composed by metal electrode-single molecule-metal electrode, I investagate the electronic transport properties within the voltage range (-3, 3V) by applying ATK, and especially address the NDR at relatively high voltage.Reviewer commented on the paper and said that one should be very careful that the coherent electron transport scheme is only applicable to the low-voltage regime (usually not beyond 1 V). Phonon-assisted electron transport may be dominant at high voltages (see for instance, J. Phys.: Condens. Matter 19 103201). I want to know how to make a response ?