This is in there. I have put the full snippet below.

```python
    # Option group for tinderbox builds
    group = OptionGroup(parser, "Tinderbox builds",
                        "Extra options for tinderbox builds.")
    group.add_option('--debug-build',
                     dest='debug_build',
                     action="store_true",
                     help="Download a debug build")
    group.add_option("--revision",
                     dest='revision',
                     help='Get a build based on the revision. This requires\
                           the use of --branch too. If --branch is not passed\
                           then mozilla-central is assumed')
    parser.add_option_group(group)
```