  The derivation of the ponderomotive force due to neutrinos by Hardy and
Melrose, Phys.Rev.D v.54, p.6491 (1996) is based on a flawed analysis of the
ponderomotive force concept. Their conclusions also contain an erroneous
physical assumption related to the neutrino emission in supernovae. A correct
analysis shows the importance of the ponderomotive force due to neutrinos in
type II supernovae explosions.
