Updated release notes for HttpClient 5.2.1 release
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index f892dab..8b815d4 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -1,17 +1,25 @@
Release 5.2.1
------------------
-This is the second GA release in the 5.2 release series.
-
-Please note that 5.2 upgrades the minimal JRE level to version 8 (8u251 is required).
-
+This is a maintenance release that fixes several regressions found in release 5.2.
Change Log
-------------------
+* Regression: Async execution runtimes set the negotiated protocol version in the execution
+ context at the wrong point of request execution.
+ Contributed by Oleg Kalnichevski <olegk at apache.org>
+
+* Cancel connection request on exception.
+ Contributed by Bryan Keller <bryanck at gmail.com>
+
* Replace deprecated use of LangUtils#equals() with Objects.equals().
Contributed by Gary Gregory <ggregory at apache.org>
+* Regression: Multipart body builder and multipart formatters fail to escape special characters
+ such as backslash and quote mark.
+ Contributed by Oleg Kalnichevski <olegk at apache.org>
+
Release 5.2
------------------
