'FOUND' keyword not found in index (pg8.2)

Hi. I was told earlier to 'report' those kind of things on this
mailinglist, if I'm making a mistake here I appologize, and I'd
appreciate guidelines for future 'reportings'.

So, there goes:

In PostgreSQL plpgsql language there is special variable calles FOUND,
which is described here:
http://www.postgresql.org/docs/8.2/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-DIAGNOSTICS

Still, there is no mention of it in postgresql Index:
http://www.postgresql.org/docs/8.2/interactive/bookindex.html

Am I missing something here, or 'FOUND' keyword should be enlisted in
Index?

Mario