diff --git a/docs/setup-guide.rst b/docs/setup-guide.rst
index 02f0d0a..a75f673 100644
--- a/docs/setup-guide.rst
+++ b/docs/setup-guide.rst
@@ -231,7 +231,7 @@ your record below.
    :header: "Name", "TTL", "Type", "Value"
    :widths: 30, 10, 10, 50
 
-   example.com., 86400, TXT, v=DKIM1; k=rsa; p=MIIBIjANBgk...Q0eBwIDAQAB
+   mail._domainkey.example.com., 86400, TXT, v=DKIM1; k=rsa; p=MIIBIjANBgk...Q0eBwIDAQAB
 
 .. code-block:: console