diff --git a/docs/index.md b/docs/index.md
index 7ca8549..c7e2596 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -630,3 +630,11 @@ $ reboot
 You can now follow the [post-installation] steps.
 
 [post-installation]: #post-installation
+
+## Acknowledgements
+
+* The [Calibre] project
+* The [Calibre-web] project
+
+[Calibre]: https://calibre-ebook.com
+[Calibre-web]: https://github.com/janeczku/calibre-web