diff --git a/docs/examples/acme-cert.yaml b/docs/examples/acme-cert.yaml
index 505aee87f..a0dd0d541 100644
--- a/docs/examples/acme-cert.yaml
+++ b/docs/examples/acme-cert.yaml
@@ -35,11 +35,11 @@ spec:
         provider: cloudflare
       domains:
       - cm-dns-cloudflare.k8s.group
-    - dns-01:
+    - dns01:
         provider: route53
       domains:
       - cm-dns-route53.k8s.group
-    - dns-01:
+    - dns01:
         provider: azuredns
       domains:
       - cm-dns-azuredns.k8s.group