diff --git a/README.md b/README.md
index 61ea3b0..4ddfdce 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,7 @@ dns:
   zones:
     - example.org.
     - example.com.
+    - subdomain.example.com.
 ```
 
 ### Running