How to increase number of gunicorns workers

I have notice the supervisor.conf in frappe is statically set the worker to 1. Is this intentional? Did I missed something? If this is the case what is the purpose of the config in common_site_config.json?

[program:frappe-bench-frappe-web]
command=/home/ccfiel/frappe-bench/env/bin/gunicorn -b 127.0.0.1:8000 -w 1 -t 120 frappe.app:application --preload