diff -r 0ae254c11921 Doc/library/functions.rst
--- a/Doc/library/functions.rst	Mon Mar 10 19:26:57 2014 +0100
+++ b/Doc/library/functions.rst	Mon Mar 10 21:17:11 2014 -0400
@@ -880,7 +880,7 @@
    to use the system default, which is usually line buffered for tty devices and
    fully buffered for other files.  If omitted, the system default is used. [#]_
 
-   Modes ``'r+'``, ``'w+'`` and ``'a+'`` open the file for updating (note that
+   Modes ``'r+'``, ``'w+'`` and ``'a+'`` open the file for updating which allows for reading and writing (note that
    ``'w+'`` truncates the file).  Append ``'b'`` to the mode to open the file in
    binary mode, on systems that differentiate between binary and text files; on
    systems that don't have this distinction, adding the ``'b'`` has no effect.