Updating local copy of documentation

[Tom Munro Glass]

When you install FreeBSD, lots of useful documentation is installed in the 
articles and books directories under /usr/share/doc/ including the essential 
handbook.

Is there a way of automatically updating this documentation - I thought that 
maybe this was done as a part of cvsup, make buildworld, etc, but apparently 
not? I realise that I can download the latest version with FTP, but it would 
be nice if this could be done as part of the normal maintenance tasks.

Regards,

Tom Munro Glass