  In a recent publication, Pfeffer and Zawadzki [cond-mat/0607150; Phys. Rev. B
74, 115309 (2006)] attempted a calculation of electron g factor in III-V
heterostructures. The authors emphasize that their outcome is in strong
discrepancy with our original result [Ivchenko and Kiselev, Sov. Phys.
Semicond. 26, 827 (1992)] and readily conclude that ``the previous theory of
the g factor in heterostructures is inadequate''. We show here that the entire
discrepancy can be tracked down to an additional contribution missing in the
incomplete elimination procedure of Pfeffer and Zawadzki. This mistake equally
affects their ``exact'' and approximate results. When the overlooked terms
stemming from the nondiagonal Zeeman interaction between light hole and
spin-orbit-split valence states are taken into account in the effective
electron dispersion, the results of the both approaches applied to the
three-level kp model become identical.
