diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -592,6 +592,8 @@
 
 OpenMP Support in Clang
 -----------------------
+* Added the support for ``atomic compare`` and ``atomic compare capture``
+  (``-fopenmp-version=51`` is required).
 
 ...