Any idea why my plist isn’t highlighting the keyword ‘debugger’

This is my p list:

db.tmLanguage

[code]<?xml version="1.0" encoding="UTF-8"?>

fileTypes rb name debugger patterns comment Tab stops like $1, $2... match \b(debugger) name keyword.control.ruby scopeName source.ruby uuid 2399a3f7-bce3-4292-adf5-bbd2695f01f5 [/code]