How can I properly update Cobbler's distro_signatures.json to support SecurityOnion?

I am trying to install SecurityOnion (an xubuntu 12.04 based linux distrobution) using cobbler.

I have followed the instructions here to get cobbler installed from source on Ubuntu 12.04.

I have also followed the instructions here to configure cobbler but I am getting an error on the cobbler import step.

I am running cobbler import --name=securityonion --path=/media/iso --breed=ubuntu but it fails

task started: 2014-03-08_110255_import
task started (id=Media import, time=Sat Mar  8 11:02:55 2014)
Found a candidate signature: breed=ubuntu, version=precise
Found a candidate signature: breed=ubuntu, version=saucy
Found a candidate signature: breed=ubuntu, version=oneiric
Found a candidate signature: breed=ubuntu, version=lucid
Found a candidate signature: breed=ubuntu, version=quantal
Found a candidate signature: breed=ubuntu, version=raring
No signature matched in /var/www/cobbler/ks_mirror/securityonion
!!! TASK FAILED !!!

I assume this is because I need to add a signature to /var/lib/cobbler/distro_signatures.json

I know I should be able to copy and paste the definition for precise and make it work since SecurityOnion uses 12.04 but I don't know how to change the definition so that it matches whatever string of text I assume cobbler is looking for under the installation files that make up securityonion.

I have read the documentation on cobbler site but it doesn't seem to give me what I need to be able to add an additional distribution.

Anyone know what I can do to modify the signatures file to accept this additional distribution?