diff --git a/README.md b/README.md
index fecad17..32cca1f 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ acme     IN  NS  ns.acme.example.com.
 ns.acme  IN  A   1.2.3.4
 
 ; For each domain you want certificates for
-_acme-challenge.example.com  IN  CNAME  example.com.acme.example.com.
+_acme-challenge.example.com  IN  CNAME  acme.example.com.
 ```
 
 Where `1.2.3.4` is the IP of the server running this container.