[DaBSD]

I've goot a multiboot system on my laptop, which is booted via GRUB (version 1.99-21ubuntu3.17). My main system is Ubuntu Linux, but I also have a custom record for booting NetBSD that I made manually. My problem is, when Ubuntu does an update involving a kernel change, boot.cfg gets automatically re-written. And while it does provide entries for all OSes presented on my HD (also Windows and Hackintosh), the NetBSD entry gets skipped, so I need to write it in each time manually. How can I work it around, to let GRUB remember all previous records, not only the ones it feels like?