Big-Bang Nucleosynthesis after Planck (vol 3, 010, 2020)

We have identified and corrected two errors in our code that in a few cases made small effects on our results. These slightly shift our constraints on the number N-nu of neutrino species, giving N-nu = -2.843 +/- 0.154. In all cases the changes are small compared to the uncertainties. None of our conclusions are changed.