#1284: "S" means "seen", not unread.
diff --git a/Doc/library/mailbox.rst b/Doc/library/mailbox.rst
index ce8dc59..5192acb 100644
--- a/Doc/library/mailbox.rst
+++ b/Doc/library/mailbox.rst
@@ -806,7 +806,7 @@
A message is typically moved from :file:`new` to :file:`cur` after its mailbox
has been accessed, whether or not the message is has been read. A message
- ``msg`` has been read if ``"S" not in msg.get_flags()`` is ``True``.
+ ``msg`` has been read if ``"S" in msg.get_flags()`` is ``True``.
.. method:: MaildirMessage.set_subdir(subdir)