diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -61,6 +61,8 @@
   v8.1-M MVE instruction set. ``<arm_mve.h>`` supports the complete API defined
   in the Arm C Language Extensions.
 
+- For the ARM target, C-language intrinsics <arm_cde.h> for the CDE instruction
+  set are now provided.
 
 * clang adds support for a set of  extended integer types (``_ExtInt(N)``) that
   permit non-power of 2 integers, exposing the LLVM integer types. Since a major
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -76,6 +76,11 @@
   set. ``<arm_mve.h>`` now supports the complete API defined in the Arm C
   Language Extensions.
 
+* Added support for assembly for the optional Custom Datapath Extension (CDE)
+  for Arm M-profile targets.
+
+* Implemented C-language intrinsics <arm_cde.h> for the CDE instruction set.
+
 Changes to the MIPS Target
 --------------------------