  An earlier analysis of observed and anticipated $\Lambda_c$ decays [M. Gronau
and J. L. Rosner, Phys.\ Rev.\ D {\bf 97}, 116015 (2018)] is provided with a
table of inputs and a figure denoting branching fractions. This addendum is
based on the 2018 Particle Data Group compilation and employs a statistical
isospin model to estimate branching fractions for as-yet-unseen decay modes.
