  In the paper [1] the process of free muon capture with simultaneous
excitation of a nuclear isomer has been suggested, claiming that ``the effect
can be detectable for selected isotopes". Here, we argue that this claim can
not be confirmed. Briefly, the process is far from the dominant mechanism for
nuclear excitation; it excites high energy nuclear levels that will not
generally decay to the isomer; the proposal assumes all incident muons will
fulfil energy criteria, ignoring dominant capture paths; and nuclei excited by
muons will have a shortened lifetime due to muonic capture.
