Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -136,6 +136,8 @@
   or pass ``/permissive`` to disable C++ operator names altogether. See
   `PR42427 <https://llvm.org/pr42427>` for more info.
 
+- Support for on-demand initialization of TLS variables was added.
+
 C Language Changes in Clang
 ---------------------------