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diff --git a/Doc/library/math.rst b/Doc/library/math.rst
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@@ -71,6 +71,9 @@ Number-theoretic and representation functions
Return *x* factorial as an integer. Raises :exc:`ValueError` if *x* is not integral or
is negative.
+ .. deprecated:: 3.9
+ Accepting floats with integral values (like ``5.0``) is deprecated.
+
.. function:: floor(x)