[exim] exim + ldap documentation?

Hi,
I would like to make Exim to route mails against an LDAP directory.
I already have a working Exim delivernig in Maildir/ format, on an
Ubuntu server.

I would like to switch to LDAP because the server's PAM will be moved
against an LDAP too, and I would like the Exim to _directly_ query the
LDAP server.

Is the documentation in [1] the one I should start with?
Have you got any additional links I should read?

Thank you.

[1]: http://www.exim.org/exim-html-4.30/doc/html/spec_9.html#SECT9.10