diff --git a/README.md b/README.md
index 4ff29f4..ff17943 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@
     * [Installation](#install-nginx-ingress)
 * [Cert-Manager (references ingress controller)](#cert-manager)
   * [Installation](#cert-manager-install)
+  * [Cluster-internal CA issuer](#cert-manager-cluster-ca-issuer)
   * [Let´s Encrypt issuer](#cert-manager-le-issuer)
   * [Deploying a LE-certificate with ingress](#cert-manager-ingress)
   * [Deploying a LE-certificate by CRD](#cert-manager-crd)
@@ -321,6 +322,9 @@ kubectl create namespace cert-manager
 helm install cert-manager --namespace cert-manager --set 'extraArgs={--dns01-recursive-nameservers-only,--dns01-recursive-nameservers=8.8.8.8:53\,1.1.1.1:53}' jetstack/cert-manager
 kubectl -n cert-manager get all
 ```
+## Cluster-internal CA Issuer <a name="user-content-cert-manager-cluster-ca-issuer"></a>
+Docs: https://cert-manager.io/docs/configuration/ca/
+
 ## Let´s Encrypt issuer <a name="user-content-cert-manager-le-issuer"></a>
 Docs: https://cert-manager.io/docs/tutorials/acme/ingress/#step-6-configure-let-s-encrypt-issuer
 ```