diff --git a/mtheme.dtx b/mtheme.dtx
index 7dc595a..5499759 100644
--- a/mtheme.dtx
+++ b/mtheme.dtx
@@ -230,7 +230,7 @@ option on every sub-package accordingly.
   Shortcut option to change the case style of all titles together.
 }
 
-\DescribeOption{plainformat}{regular, lowercase, uppercase}{lowercase}{
+\DescribeOption{plaintitleformat}{regular, lowercase, uppercase}{lowercase}{
   Control the case style of the plain title.
 }
 
diff --git a/mtheme.pdf b/mtheme.pdf
index 5b06386..84df53e 100644
Binary files a/mtheme.pdf and b/mtheme.pdf differ