modify-resources --max-mem not working

Tried:

virtualmin modify-resources --all-domains --max-mem 100M
virtualmin modify-resources --all-domains --max-mem=100M
virtualmin modify-resources --all-domains --max-mem 100
virtualmin modify-resources --all-domains --max-mem=100

And nothing worked -- just came back with a syntax help

Status: 
Closed (fixed)