maybe we can do something similar to `highlight-markup-buffers` with a hidden\r
buffer containing the unmodified copy.\r
\r
-* Out of modes providing similar functionality, `highlight-changes-mode` is the\r
+* [git-gutter](https://github.com/syohex/emacs-git-gutter) provides the commands\r
+ to show/hide/toggle indicators for the same information, and allows you to\r
+ customize how the indicators look.\r
+\r
+* Out of other modes providing similar functionality, `highlight-changes-mode` is the\r
closest I could find. Angry Fruit Salad aside, it may be fine for writing\r
prose, but I think it's pretty much useless for version-controlled files.\r