  In this addendum to Phys.\ Rev.\ D {\bf 95}, 054018 (2017) we recompute the
rates for the decays of the Higgs boson to a vector quarkonium plus a photon,
where the vector quarkonium is $J/\psi$, $\Upsilon(1S)$, $\Upsilon(2S)$, or
$\Upsilon(3S)$. We correct an error in the Abel-Pad\'e summation formula that
was used to carry out the evolution of the quarkonium light-cone distribution
amplitude in Phys.\ Rev.\ D {\bf 95}, 054018 (2017). We also correct an error
in the scale of quarkonium wave function at the origin in Phys.\ Rev.\ D {\bf
95}, 054018 (2017) and introduce several additional refinements in the
calculation.
