  My previous work [arXiv:1902.00977] studied the dynamics of R\'enyi
entanglement entropy $R_\alpha$ in local quantum circuits with charge
conservation. Initializing the system in a random product state, it was proved
that $R_\alpha$ with R\'enyi index $\alpha>1$ grows no faster than
"diffusively" (up to a sublogarithmic correction) if charge transport is not
faster than diffusive. The proof was given only for qubit or spin-$1/2$
systems. In this note, I extend the proof to qudit systems, i.e., spin systems
with local dimension $d\ge2$.
