diff --git a/categories/devops/kubernetes.md b/categories/devops/kubernetes.md
index 10d119d..8a56b72 100644
--- a/categories/devops/kubernetes.md
+++ b/categories/devops/kubernetes.md
@@ -702,3 +702,4 @@ k3s is intended to be a fully compliant Kubernetes distribution with the followi
 ## Links
 
 - https://kubernetes.io/docs/concepts/overview/components
+- [Writing a Custom Controller: Extending the Functionality of Your Cluster [I] - Aaron Levy](https://www.youtube.com/watch?v=_BuqPMlXfpE)