2018-10-18 12:11 GMT-03:00, Mauro Aranda <maurooaranda@gmail.com>:
> Hello.
>
> Regarding the Emacs manual, I think the following paragraph in the
> "Reverting a Buffer" section is outdated:
> "Reverting marks the buffer as not modified. It also clears the buffer's
> undo
> history (see Undo). Thus, the reversion cannot be undone—if you change your
> mind yet again, you can't use the undo commands to bring the reverted
> changes
> back."
>
> I think that was the previous behavior of revert-buffer, but it was changed
> a while ago, so now it is possible to do M-x revert-buffer RET yes RET
> and then do
> C-/ to bring the reverted changes back.
>
>

I propose the attached patch.  Please let me know what you think.