diff --git a/README.md b/README.md
index b5056b7..b84f02e 100644
--- a/README.md
+++ b/README.md
@@ -166,6 +166,7 @@ spec:
   - example.com
   issuerRef:
     name: letsencrypt-staging
+    kind: ClusterIssuer
   secretName: example-com-tls
 ```