bpo-41513: Add docs and tests for hypot() (GH-22238)
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index 6ec1fee..bbf6464 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -481,6 +481,11 @@
Added support for n-dimensional points. Formerly, only the two
dimensional case was supported.
+ .. versionchanged:: 3.10
+ Improved the algorithm's accuracy so that the maximum error is
+ under 1 ulp (unit in the last place). More typically, the result
+ is almost always correctly rounded to within 1/2 ulp.
+
.. function:: sin(x)