Someting works not as intended. But at least it has to work somehow.

Something went horribly wrong. Use only for problems that abort the make process or lead to useless targets.

This entry needs in depth review. Use for legal text or text intended for a broader audience. It may also be used for complex programs.

This entry needs to be overviewed by someone other than the author(s). For a more in depth review use ~proofreading.