diff --git a/projects_using_cobra.md b/projects_using_cobra.md
index aa791077..ced51f68 100644
--- a/projects_using_cobra.md
+++ b/projects_using_cobra.md
@@ -14,6 +14,7 @@
 - [Kubernetes](http://kubernetes.io/)
 - [Linkerd](https://linkerd.io/)
 - [Mattermost-server](https://github.com/mattermost/mattermost-server)
+- [Metal Stack CLI](https://github.com/metal-stack/metalctl)
 - [Moby (former Docker)](https://github.com/moby/moby)
 - [Nanobox](https://github.com/nanobox-io/nanobox)/[Nanopack](https://github.com/nanopack)
 - [OpenShift](https://www.openshift.com/)