  The identifications of transverse boost and rotation operators in light front
theory done in Phys. Rev. Lett. {109}, 152005 (2012) is incorrect. The simple
parton interpretation claimed is, in fact, for the transverse boost operator.
Manifestation of Lorentz symmetry as claimed in the context of their
calculation involving transverse Pauli-Lubanski polarization vector is
unsupported.
