Issue #19641: Added the audioop.byteswap() function to convert big-endian
samples to little-endian and vice versa.
diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst
index 6f949a9..31f7cbd 100644
--- a/Doc/whatsnew/3.4.rst
+++ b/Doc/whatsnew/3.4.rst
@@ -415,6 +415,9 @@
 
 Added support for 24-bit samples (:issue:`12866`).
 
+Added the :func:`~audioop.byteswap` function to convert big-endian samples
+to little-endian and vice versa (:issue:`19641`).
+
 
 base64
 ------