  In the recent letter [1] by H. Ikeda and Y. Ohashi, a new, very attractive
idea is proposed for the explanation of the micromagnetism in U-based heavy
fermion compounds. For this sake a nontrivial spin density wave (d-SDW) is
introduced. Our goal is to claim, that in the model considered, the mean-field
analysis is incomplete: the ferromagnetic state missed by [1] overcomes d-SDW
in a large region of the phase diagram (Fig.1 in [1]).
