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#### 6.4.13.9 Article marks

An article identified by `uniq` is considered to have the mark `flag` when the file `.nnmaildir/marks/flag/uniq` exists. When Gnus asks `nnmaildir` for a group’s marks, `nnmaildir` looks for such files and reports the set of marks it finds. When Gnus asks `nnmaildir` to store a new set of marks, `nnmaildir` creates and deletes the corresponding files as needed. (Actually, rather than create a new file for each mark, it just creates hard links to `.nnmaildir/markfile`, to save inodes.)

You can invent new marks by creating a new directory in `.nnmaildir/marks/`. You can tar up a maildir and remove it from your server, untar it later, and keep your marks. You can add and remove marks yourself by creating and deleting mark files. If you do this while Gnus is running and your `nnmaildir` server is open, it’s best to exit all summary buffers for `nnmaildir` groups and type `s` in the group buffer first, and to type `g` or `M-g` in the group buffer afterwards. Otherwise, Gnus might not pick up the changes, and might undo them.