diff --git a/default.nix b/default.nix
index 5e54952..39d1e09 100644
--- a/default.nix
+++ b/default.nix
@@ -997,7 +997,7 @@ in
                   DKIM selectors used for signing outgoing mail for this domain.
 
                   When no selector is configured a default selector will be
-                  created with settings inherited from {option}`mailserver.defaults.dkim <mailserver.dkim.defaults.keyLength>`.
+                  created with settings inherited from {option}`mailserver.dkim.defaults <mailserver.dkim.defaults.keyLength>`.
                 '';
                 type = types.attrsOf (
                   types.submodule ({
@@ -1601,5 +1601,9 @@ in
       [ "mailserver" "dkim" "defaults" "selector" ]
     )
     (mkRenamedOptionModule [ "mailserver" "dkimKeyType" ] [ "mailserver" "dkim" "defaults" "keyType" ])
+    (mkRenamedOptionModule
+      [ "mailserver" "dkimKeyBits" ]
+      [ "mailserver" "dkim" "defaults" "keyLength" ]
+    )
   ];
 }
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