adding Server-Side Includes to default files

[Sam Carleton]

I would like to have server-side includes to be parsed on DirectoryIndex
files.  I have followed the example in "Writing Apache Modules in Perl
and C" and have my Apache::ESSI and this is what is in my perl.conf:

<Files ~ "\.ehtml$">
    SetHandler perl-script
    PerlHandler Appache::ESSI
    PerlSetVar ESSIDefs conf/essi.defs
</Files>
AddType text/html .ehtml

What type of directive to I need to put into perl.conf so that the code
gets called on a directory index file?

Sam