portmaster options

[jb]

jb <jb.1234abcd <at> gmail.com> writes:

> ... 
> >      --index-only
> >          do not try to use /usr/ports.  For updating ports when no 
> >          /usr/ports
> >          directory is present the -PP|--packages-only option is required.  
> >          See the ENVIRONMENT section below for additional requirements.
> > 
> ...

And -PP|--packages-only option implies "index only" entry behavior, so there
is redundancy here as well.

Does anybody know where this --index-only option really matter ?
jb