[chef] Undocumented subcommand in knife?

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Hello.

I'm the definition of a newbie at chef/knife so I apologize in advance for my
question.

Knife/Chef version:
> knife -v
Chef: 11.16.4

I'm following some tutorial in how to run vagrant/chef solo, and the tutorial
says:

"Run knife solo init ."

Instead I ran "knife help" to see more about knife, and I see no reference to
this command.
"solo" is not listed as an available subcommand in the list shown when running
"knife help knife".

Am I blind or how would I find out about the "solo" command when just starting
from "knife help"?

Best Regards
/Thomas