  In a recent paper, Phys. Rev. Lett. 94, 211101 (2005) [hep-ph/0502166],
Schmitt et al. have proposed a new mechanism to explain the observed velocities
of pulsars. The proposed explanation is based on anisotropic emission of
neutrinos from a cooling neutron star at temperatures below 0.1 MeV, thousands
of years after the supernova. However, while neutrinos are copiously produced
during the first minute of the supernova explosion, at later times the neutrino
emission is negligible. Therefore, the proposed mechanism is not viable.
