diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -614,6 +614,15 @@
   memory placement. It emits a warning if something in the code provably prevents
   an instance from a read-only memory placement.
 
+- Introduced new attribute ``__attribute__((target_version("cpu_features")))``
+  and expanded the functionality of the existing attribute
+  ``__attribute__((target_clones("cpu_features1","cpu_features2",...)))`` to
+  support Function Multi Versioning on AArch64 target. It detects at runtime
+  which function versions are supported by CPU and calls the one with highest
+  priority. Refer to `clang attributes
+  <https://clang.llvm.org/docs/AttributeReference.html#target-version>`_ for
+  more details.
+
 Windows Support
 ---------------
 - For the MinGW driver, added the options ``-mguard=none``, ``-mguard=cf`` and
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -133,6 +133,10 @@
 * Added support for the Neoverse V2 CPU.
 * Added support for assembly for RME MEC (Memory Encryption Contexts).
 * Added codegen support for the Armv8.3 Complex Number extension.
+* Implemented `Function Multi Versioning
+  <https://arm-software.github.io/acle/main/acle.html#function-multi-versioning>`_
+  in accordance with Arm C Language Extensions specification. Currently in Beta
+  state.
 
 Changes to the AMDGPU Backend
 -----------------------------