Add missing href to maildir in README HEAD main

1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 4984b78..b90b420 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ by the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 [mbox]: https://en.wikipedia.org/wiki/Mbox
+[maildir]: https://en.wikipedia.org/wiki/Maildir
 [RSS]: https://www.rssboard.org
 [nh3]: https://nh3.readthedocs.io
 [mistune]: https://mistune.lepture.com