Documentation for Issue #5920.
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index 52bd8f1..0eb1b57 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -434,7 +434,10 @@
| ``'%'`` | Percentage. Multiplies the number by 100 and displays |
| | in fixed (``'f'``) format, followed by a percent sign. |
+---------+----------------------------------------------------------+
- | None | The same as ``'g'``. |
+ | None | Similar to ``'g'``, except with at least one decimal |
+ | | point and a default precision of 12. This is intended to |
+ | | match :func:`str`, except you can add the other |
+ | | format modifiers. |
+---------+----------------------------------------------------------+