Defining help text for console command options

I’m trying to make my first console command following the information here: https://www.yiiframework.com/doc/guide/2.0/en/tutorial-console
specifically the section under Options and Options Aliases.

When running the command with --help it lists the options I have added to my controller. Where do I add the helpful information for each option like the default --appconfig shows?

Also, how do I differentiate options which are specific to an action?