  We point out that the suppression in the ratio R_dAu recently observed by the
BRAHMS collaboration in forward scattering is stronger than usually
appreciated. This is related to the fact that at forward rapidities BRAHMS
measures negatively charged hadrons and that R_dAu is defined from the ratio of
dA and pp scattering cross sections. We also investigate the influence of
standard shadowing on R_dAu, and the typical values of partonic momentum
fractions relevant in forward scattering. We find that x_Au > 0.02 dominate in
the cross section.
