diff --git a/docs/02-certificate-authority.md b/docs/02-certificate-authority.md
index c33e51a..93cb9e1 100644
--- a/docs/02-certificate-authority.md
+++ b/docs/02-certificate-authority.md
@@ -160,7 +160,8 @@ cat > kubernetes-csr.json <<EOF
     "10.240.0.21",
     "10.240.0.22",
     "${KUBERNETES_PUBLIC_ADDRESS}",
-    "127.0.0.1"
+    "127.0.0.1",
+    "kubernetes.default"
   ],
   "key": {
     "algo": "rsa",