  The conservation of the number of particles within the QRPA plays an
important role in the evaluation muon capture rates in all light nuclei with A
\precsim 30 . The violation of the CVC by the Coulomb field in this mass region
is of minor importance, but this effect could be quite relevant for medium and
heavy nuclei studied previously. The extreme sensitivity of the muon capture
rates on the 'pp' coupling strength in nuclei with large neutron excess when
described within the QRPA is pointed out. We reckon that the comparison between
theory and data for the inclusive muon capture is not a fully satisfactory test
on the nuclear model that is used. The exclusive muon transitions are much more
robust for such a purpose.
