diff --git a/README.md b/README.md
index f9a877a5..e0dcec2d 100644
--- a/README.md
+++ b/README.md
@@ -625,6 +625,7 @@ _Personal e-book management software._
   - [COPS](https://blog.slucas.fr/en/oss/calibre-opds-php-server) - Lightweight e-book server alternative to Calibre content server or Calibre2OPDS. ([Demo](http://cops-demo.slucas.fr/index.php), [Source Code](https://github.com/seblucas/cops)) `GPL-2.0` `PHP`
   - [The Epube](https://tt-rss.org/the-epube) - Self-hosted web EPUB reader using EPUB.js, Bootstrap, and Calibre. ([Source Code](https://git.tt-rss.org/fox/the-epube)) `GPL-3.0` `PHP`
 - [Polar Bookshelf](https://getpolarized.io/) - Polar is a personal knowledge repository for PDF and web content supporting incremental reading and document annotation. ([Source Code](https://github.com/burtonator/polar-bookshelf)) `GPL` `Javascript`
+- [Ubooquity](https://vaemendis.net/ubooquity/) - Ubooquity is a versatile, lightweight, multi-platform, and secure free home server for your comics and e-book library.
 
 _Enterprise-class library management software._