bpo-32790: Add info about alt format using # for 'g' in chart (GH-6624)
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index af52af0..e2983db 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -508,7 +508,8 @@
| | with presentation type ``'e'`` and precision ``p-1``. |
| | In both cases insignificant trailing zeros are removed |
| | from the significand, and the decimal point is also |
- | | removed if there are no remaining digits following it. |
+ | | removed if there are no remaining digits following it, |
+ | | unless the ``'#'`` option is used. |
| | |
| | Positive and negative infinity, positive and negative |
| | zero, and nans, are formatted as ``inf``, ``-inf``, |