How do I pass the -i option during boot time?

Hi.

I Upgraded to version 7.1.3 on my RH7.1 and it seems that this version
of postgresql doesn't have network activeated by default. Ho do I
specify to the postmaster that it must start with the -i option through
the /etc/rc.d/init.d/postgresql script.
Do I have to set something in the config files in /var/lib/pgsql/data?

Thanks