Note that the de-facto existing standard (FreeBSD) doesn't have the hyphen. If these are intended to be read by tooling, it's probably best to keep consistency

Note that the de-facto existing standard (FreeBSD) doesn't have the hyphen. If these are intended to be read by tooling, it's probably best to keep consistency with existing practice, even though every other trailer seems to be hyphenated. (The Git software can cope with spaces in trailer names.)