  We review recent progress on the numerical determination of the Hadronic
Light-by-Light contribution to the anomalous magnetic moment of the muon. We
advocate for a slight increase of the White Paper number for its Standard Model
prediction, to $(102\pm17)\times10^{-11}$, accounting for a revised
contribution from axial-vector mesons and short-distance constraints. This
$\sim10\%$ larger result seems to be supported by the most recent lattice QCD
evaluations.
