  We revisit the effect of the (Dirac) CP-violating phase on neutrino lepton
number asymmetries in both mass- and flavor-basis. We found that, even if there
are sizable effects on muon- and tau-neutrino asymmetries, the effect on the
asymmetry of electron-neutrinos is at most similar to the upper bound set by
BBN for initial neutrino degeneracy parameters smaller than order unity. We
also found that, for the asymmetries in mass-basis, the changes caused by
CP-violation is of sub-\% level which is unlikely to be accesible neither in
the current nor in the forthcoming experiments.
