  We point out that most of the classical thermodynamics results in the paper
have been known in the literature, see Kestin and Woods, for quite some time
and are not new, contrary to what the authors imply. As shown by Kestin, these
results are valid for quasistatic irreversible processes only and not for
arbitrary irreversible processes as suggested in the paper. Thus, the
application to the Jarzynski process is limited.
