diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -111,6 +111,8 @@
   Erratum 1655431. This is enabled by default when targeting either CPU.
 * Implemented generation of Windows SEH unwind information.
 * Switched the MinGW target to use SEH instead of DWARF for unwind information.
+* Added support for a new -mframe-chain=(none|aapcs|aapcs+leaf) command-line
+  option, which controls the generation of AAPCS-compliant Frame Records.
 
 Changes to the AVR Backend
 --------------------------