# undofile

today i came across a friend's `.vimrc` and found that he had some settings i'd
never seen before:

```
set undofile
set undodir=~/.vim/undo
```

i am now testing these settings out. you can use it do undo changes across vim
sessions.[^1]

[1]: http://vimdoc.sourceforge.net/htmldoc/options.html#'undofile'