Mark deprecated modules as such.
diff --git a/Doc/library/mimewriter.rst b/Doc/library/mimewriter.rst
index cf93473..2070ff6 100644
--- a/Doc/library/mimewriter.rst
+++ b/Doc/library/mimewriter.rst
@@ -3,6 +3,7 @@
 
 .. module:: MimeWriter
    :synopsis: Write MIME format files.
+   :deprecated:
 
 .. sectionauthor:: Christopher G. Petrilli <petrilli@amber.org>