Where is "--localcacert" in Puppet man page?

I am new to Puppet. We have a command and it uses the --localcacert option. The command looks like this: puppet agent -t --localcacert --ca_server --onetime --waitforcert 30 I want to know what the option --localcacert do but it is not in the man page. It's not even here: https://www.puppet.com/docs/puppet/5.5/man/agent nor here: https://linux.die.net/man/8/puppet-agent Why? The above command works, so therefore it is recognized by puppet as a valid option, but why is it not in the man page?