diff --git a/README.md b/README.md
index e117ab4..2afee87 100644
--- a/README.md
+++ b/README.md
@@ -18,3 +18,9 @@
 
 ```kubectl apply -k overlays/dev```
 
+## cert-manager
+
+Install crds : 
+
+```kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.12.0/cert-manager.yaml```
+