  In a recent paper (arXiv:1403.5221), Kang et al.proposed the so-called
"rapidity factorization" for the single inclusive forward hadron production in
pA collisions. We point out that the leading small-x logarithm was
mis-identified in this paper, and hence the newly added next-to-leading order
correction term is unjustified and should be absent in view of the small-x
factorization.
