  We provide bulk transport evidence for twin-boundary pinning of vortices in
FeSe. We measure interlayer resistance in FeSe in magnetic fields and find
that, as the field is rotated in the $ab$ plane, the flux-flow resistivity is
suppressed when the field direction is parallel to twinning planes. The width
of the associated dip in the resistance vs in-plane field direction curve
varies as $T^{1/2}B^{-3/4}$, consistent with the creation of kinked vortices
near the parallel field geometry.
