updating to last sarge

[roberto <roberto03@gmail.com>]

hello
in order to perform a distro upgrade to debian etch i have to do the
update to the last released sarge (as stated in debian official guide
to this kind of upgrade)

so i have to change the occurrences of "stable" in my /etc/apt/sources.list
to "sarge"

# My sources.list file.

# Official Debian mirror
deb http://ftp.it.debian.org/debian/             stable main non-free contrib
deb-src http://ftp.it.debian.org/debian/        stable main non-free contrib
deb-src http://ftp.it.debian.org/debian/        stable main contrib non-free

# Security updates
deb http://security.debian.org/ stable/updates main contrib non-free
# end

then
- perform an update
- then starting the upgrade procedure

am i missing something ?
thank you for any help
-- 
roberto
OS: GNU/Linux, Debian