skip_tags not documented for puppet agent

Puppet Version: 5.5.16
Puppet Server Version: 5.5.16
OS Name/Version: FreeBSD-12-RELEASE

puppet agent --help

...
'--tags' allows you to specify what portions of a configuration you want
to apply. Puppet elements are tagged with all of the class or definition
names that contain them, and you can use the 'tags' flag to specify one
of these names, causing only configuration elements contained within
that class or definition to be applied. This is very useful when you are
testing new configurations – for instance, if you are just starting to
manage 'ntpd', you would put all of the new elements into an 'ntpd'
class, and call puppet with '--tags ntpd', which would only apply that
small portion of the configuration during your testing, rather than
applying the whole thing.

...

Desired Behavior:

Add a section describing --skip_tags option.

Actual Behavior:

See above