documentation about gpg.conf file?

[Realos]

I was wondering if there is a good documentation about how to edit
gpg.conf file. Over the last weeks I have gained quite an acceptable
understanding of gpg but still need to go a log way before feeling
realy comfortable with advanced options.

I would like to define my own policy for WoT and thus need to override
default settings for marginals-needed, completes-needed, max-cert-depth,
default-cert-level etc.

Could not find any good documentation. Closest I came across was 
http://kai.iks-jena.de/pgp/gpg/gpg5.html (German). Manpage only
describes how to enter these option on command line but no special not
about configuration file is give. 

Any help/hint is much appreciated.

Regards.

-- 
Realos