Grammar fix
diff --git a/Doc/library/email.message.rst b/Doc/library/email.message.rst
index e1fb20e..850072b 100644
--- a/Doc/library/email.message.rst
+++ b/Doc/library/email.message.rst
@@ -38,7 +38,7 @@
.. method:: Message.as_string([unixfrom])
- Return the entire message flatten as a string. When optional *unixfrom* is
+ Return the entire message flattened as a string. When optional *unixfrom* is
``True``, the envelope header is included in the returned string. *unixfrom*
defaults to ``False``.