diff --git a/docs/02-certificate-authority.md b/docs/02-certificate-authority.md
index 5395c93..71fa0c9 100644
--- a/docs/02-certificate-authority.md
+++ b/docs/02-certificate-authority.md
@@ -149,6 +149,9 @@ cat > kubernetes-csr.json <<EOF
     "worker0",
     "worker1",
     "worker2",
+    "ip-10-240-0-30",
+    "ip-10-240-0-31",
+    "ip-10-240-0-32",
     "10.32.0.1",
     "10.240.0.10",
     "10.240.0.11",