diff -r a486b673b57f Doc/library/string.rst
--- a/Doc/library/string.rst	Fri Oct 03 20:18:48 2014 -0400
+++ b/Doc/library/string.rst	Sat Oct 04 09:24:09 2014 +0100
@@ -478,10 +478,11 @@
    | ``'%'`` | Percentage. Multiplies the number by 100 and displays    |
    |         | in fixed (``'f'``) format, followed by a percent sign.   |
    +---------+----------------------------------------------------------+
-   | None    | Similar to ``'g'``, except with at least one digit past  |
-   |         | the decimal point and a default precision of 12. This is |
-   |         | intended to match :func:`str`, except you can add the    |
-   |         | other format modifiers.                                  |
+   | None    | With an explicit precision, this behaves like ``g``      |
+   |         | formatting, except that outputs in non-scientific        |
+   |         | notation will always have a decimal point and at least   |
+   |         | one digit following the point.  Without an explicit      |
+   |         | precision it behaves like :func:`str`.                   |
    +---------+----------------------------------------------------------+