  We give a short proof of the main result of our previous paper [2]: every
Schmidt subspace of a Hankel operator is the image of a model space by an
isometric multiplier. This class of subspaces is closely related to nearly
$S^*$-invariant subspaces, and our proof uses Hitt's theorem on the structure
of such subspaces. We also give a formula for the action of a Hankel operator
on its Schmidt subspace.
