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-rw-r--r--Doc/library/string.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index a000bb4..913672a 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -409,7 +409,9 @@ conversions, trailing zeros are not removed from the result.
.. index:: single: , (comma); in string formatting
-The ``','`` option signals the use of a comma for a thousands separator.
+The ``','`` option signals the use of a comma for a thousands separator for
+floating-point presentation types and for integer presentation type ``'d'``.
+For other presentation types, this option is an error.
For a locale aware separator, use the ``'n'`` integer presentation type
instead.