Issue #17839: mention base64 change in What's New
diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst
index a04aee8..197702a 100644
--- a/Doc/whatsnew/3.4.rst
+++ b/Doc/whatsnew/3.4.rst
@@ -327,6 +327,14 @@
Added support for 24-bit samples (:issue:`12866`).
+base64
+------
+
+The encoding and decoding functions in :mod:`base64` now accept any
+:term:`bytes-like object` in cases where it previously required a
+:class:`bytes` or :class:`bytearray` instance (:issue`17839`)
+
+
colorsys
--------