#15438: merge with 3.2.
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index 2f2558b..b69d6c6 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -215,6 +215,10 @@
``x`` is negative, and ``y`` is not an integer then ``pow(x, y)``
is undefined, and raises :exc:`ValueError`.
+ Unlike the built-in ``**`` operator, :func:`math.pow` converts both
+ its arguments to type :class:`float`. Use ``**`` or the built-in
+ :func:`pow` function for computing exact integer powers.
+
.. function:: sqrt(x)