missing script for etch in package debootstrap (version 0.3.3.2etch1)

[Federico Giacomini <federico.giacomini@polito.it>]

Hello,
in the scripts' directory used by debootstrap both symbolic links 'etch' and 'lenny' point to 'sid':

$ ls -al /usr/lib/debootstrap/scripts/
total 129
drwxr-xr-x 2 root root  520 2007-10-11 14:12 .
drwxr-xr-x 3 root root  136 2007-10-11 14:12 ..
-rw-r--r-- 1 root root 5486 2007-07-31 21:16 breezy
-rw-r--r-- 1 root root 5582 2007-07-31 21:16 dapper
-rw-r--r-- 1 root root 6245 2007-07-31 21:16 edgy
lrwxrwxrwx 1 root root    3 2007-10-11 14:12 etch -> sid
-rw-r--r-- 1 root root 6363 2007-07-31 21:16 feisty
-rw-r--r-- 1 root root 5782 2007-07-31 21:16 gutsy
-rw-r--r-- 1 root root 7881 2007-07-31 21:16 hoary
-rw-r--r-- 1 root root 5827 2007-07-31 21:16 hoary.buildd
lrwxrwxrwx 1 root root    3 2007-10-11 14:12 lenny -> sid
-rw-r--r-- 1 root root 3408 2007-07-31 21:16 potato
-rw-r--r-- 1 root root 8387 2007-07-31 21:16 sarge
-rw-r--r-- 1 root root 5672 2007-07-31 21:16 sarge.buildd
-rw-r--r-- 1 root root 5902 2007-07-31 21:16 sarge.fakechroot
-rw-r--r-- 1 root root 5833 2007-07-31 21:16 sid
-rw-r--r-- 1 root root 7443 2007-07-31 21:16 warty
-rw-r--r-- 1 root root 5709 2007-07-31 21:16 warty.buildd
-rw-r--r-- 1 root root 7722 2007-07-31 21:16 woody
-rw-r--r-- 1 root root 5709 2007-07-31 21:16 woody.buildd

Why is etch still linked to the unstable distribution? How can I chroot into etch?
Thank you in advance for any help.

Federico