diff --git a/README.md b/README.md
index 627364c..be7fd26 100644
--- a/README.md
+++ b/README.md
@@ -181,6 +181,7 @@ Pull requests on interesting tools/projects/resources are welcome.
 * [gitbackup](https://github.com/amitsaha/gitbackup) - a tool to backup your Bitbucket, GitHub and GitLab repositories.
 * [soba](https://github.com/jonhadfield/soba) - scheduled backups of repositories from popular providers with change detection.
 * [tig](https://github.com/jonas/tig) - text-mode interface for git.
+* [git-plumber](https://github.com/ejiektpobehuk/git-plumber) - educational read-only git client that shows how other git clients change the content of the `.git` folder.
 
 ## Extensions
 *Git is designed for source control management. but people extend the idea and push version control to everywhere*