On Fri, Dec 27, 2019 at 12:43:46PM +0200, Mpho Jele wrote:
> Check this out: https://github.com/joodland/bm/blob/master/README.md

Throwing "annotate" into the EmacsWiki draws some hits (note:
"annotate" is also a term in version control jargon, where it
has a slightly different meaning, so some filtering is needed):

  https://www.emacswiki.org/emacs/OrgAnnotateFile
  https://www.emacswiki.org/emacs/AnnotationMode
  https://www.emacswiki.org/emacs/org-annotate-file.el
  https://www.emacswiki.org/emacs/Annotate
  https://www.emacswiki.org/emacs/annotate.el

Besides, there's an annotate minor mode in Melpa (M-x list-packages,
in a reasonably recent Emacs) which might cover your needs.

Cheers
-- t