Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -85,6 +85,8 @@
 -  The ``overloadable`` attribute now allows at most one function with a given
    name to lack the ``overloadable`` attribute. This unmarked function will not
    have its name mangled.
+-  The ```ms_abi`` attribute and the ``__builtin_ms_va_list`` types and builtins
+   are now supported on AArch64.
 
 Windows Support
 ---------------