How does genindex.html get populated when making docs?

Hi all:

I am lookng through customizing.txt and that's a huge doc. I thought it
may be of more use with an index.

I am using:

   python3 ./setup.py build_doc

to build documentation in html format into share/doc/roundup/html.

This does create an html/genindex.html file, but there are no terms in
it. I added:

.. index:: schema

.. index::
    single: schema

and :index:`schema` to customizing.txt to try to get the term into the
index. No luck. I have a feeling I am missing something simple but
what?

Any ideas?

--
				-- rouilj
John Rouillard
===========================================================================
My employers don't acknowledge my existence much less my opinions.