Update CHANGELOG.md (#2458)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d719b08ef8b13b6bbfb3012852e0c675ac506c82..a0832471b71a4fdb2eebd26fe2beac2e6edc18f3 100644 (file)
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## 0.23.1
 
+**Note**: The 0.23.1 release should have used a proper version bump, rather than a minor point release. 
+There are API surface area changes that may affect some users.
+See the "Removed" section of these release notes for details.
+
 ### Added
 
 * Support for Python 3.11. (#2420)
@@ -20,6 +24,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Removed
 
+* Upload files *must* always be opened in binary mode. (#2400)
 * Drop `.read`/`.aread` from `SyncByteStream`/`AsyncByteStream`. (#2407)
 * Drop `RawURL`. (#2241)