Are file comments possible?

[Tyrannocaster]

Is it possible using Linux to do the equivalent of what you can do on a Mac with file comments? That is, a separate comment about the file that you add to it later but which is separate from it, yet stays attached to it and can be edited. They are really useful for labeling things or making notes about whatever. This question may not make sense to people who haven't used it on a Mac, in which case I suppose it's probably not possible to do with Linux.