MLECO-3094: Updated to 22.05 release components

Signed-off-by: Richard Burton <richard.burton@arm.com>
Change-Id: Icd208b5fc92d08e8dfbff95feecf3b387e76ccb4
diff --git a/release_notes.txt b/release_notes.txt
index a85068a..f2ab3af 100644
--- a/release_notes.txt
+++ b/release_notes.txt
@@ -1,3 +1,12 @@
+Changes in 22.05
+    * Support for 22.05 Ethos-U component and dependencies (core-driver, core-platform, Vela 3.4.0, CMSIS, TensorFlow Lite Micro).
+    * Restructuring of repository sources to allow generation of CMSIS packs.
+    * Added support for Arm Cortex-M85, armclang 6.18 is required
+    * Reduce minimum requirements of Python to 3.7 to align with Vela 3.4.0.
+    * Increase minimum requirements of CMake to 3.21.0
+    * Documentation updates.
+    * Various bug fixes.
+
 Changes in 22.02
     * Support for 22.02 Ethos-U component and dependencies (core-driver, core-platform, Vela 3.3.0, CMSIS, TensorFlow Lite Micro).
     * Added Object Detection use case.