release-notes

Author: izvolov

libcxx/docs/ReleaseNotes/21.rst

@@ -60,6 +60,9 @@ Improvements and New Features
 
 - Updated formatting library to Unicode 16.0.0.
 
+- The ``std::stable_sort`` algorithm uses radix sort for floating-point types now, which can improve the performance
+  up to 10 times, depending on type of sorted elements and the initial state of the sorted array.
+
 Deprecations and Removals
 -------------------------