diff -r d9921cb6e3cd Doc/library/stdtypes.rst
--- a/Doc/library/stdtypes.rst	Mon Apr 29 12:26:01 2013 +0300
+++ b/Doc/library/stdtypes.rst	Mon Apr 29 22:59:58 2013 +0300
@@ -906,7 +906,8 @@
    ``'ignore'``, ``'replace'``, ``'xmlcharrefreplace'``, ``'backslashreplace'`` and
    any other name registered via :func:`codecs.register_error`, see section
    :ref:`codec-base-classes`. For a list of possible encodings, see section
-   :ref:`standard-encodings`.
+   :ref:`standard-encodings`. Return an encoded version of the string always
+   including an extra trailing newline (``'\n'``).
 
    .. versionadded:: 2.0