'chkconfig umountnfs.sh on' does not create symlink

on Debian, the init script /etc/init.d/umountnfs.sh has default stop in runlevel 0 and 6. # Default-Stop: 0 6 but there is no symlink in /etc/rc0.d/ or /etc/rc6.d/ on my system. I am trying to enable the script in these runlevels, but chkconfig does not create the symlink chkconfig umountnfs.sh on I could create the symlink manually, but I believe the chkconfig script does more than just symlink. I think it also calculates dependencies and modifies the .depend.* files **How can I enable umountnfs.sh script on shutdown ?**