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Mecheri and Marsch concluded that drift currents caused by density gradientscan serve as an energy source for a plasma instability, in particular for theexcitation of ion-cyclotron waves in the solar corona. It is pointed out thatthese authors overlooked some fundamental properties of the drift motion ininhomogeneous plasmas. The calculation is repeated, taking into account themissing terms. It is shown that the diamagnetic drift, which is essential forthe new physical phenomena obtained by Mecheri and Marsch, can not contributeto the flux in the continuity equation. Moreover, the part of the ionpolarization drift contribution to the ion cancels out exactly with thecontribution of the part of the stress tensor drift to the same flux. Theion-cyclotron waves in the solar corona can thus not be excited in the waysuggested by Mecheri and Marsch.

Comment on "Drift instabilities in the solar corona within the multi-fluid description" [Astron. Astrophys. {\bf 481}, 853 (2008)]