diff --git a/docs/api-types/issuer/spec.md b/docs/api-types/issuer/spec.md
index 0e59ac332..d2b4c11ea 100644
--- a/docs/api-types/issuer/spec.md
+++ b/docs/api-types/issuer/spec.md
@@ -77,7 +77,8 @@ spec:
   acme:
     email: user@example.com
     server: https://acme-staging.api.letsencrypt.org/directory
-    privateKey: example-issuer-account-key
+    privateKeySecretRef:
+      name: example-issuer-account-key
     dns-01:
       providers:
       - name: prod-clouddns