diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -77,6 +77,9 @@
 
 - Clang plugin arguments can now be passed through the compiler driver via
   ``-fplugin-arg-pluginname-arg``, similar to GCC's ``-fplugin-arg``.
+- The ``-mno-bti-at-return-twice`` flag will make sure a BTI instruction won't
+  be added after a setjmp or possible other return-twice construct (ARM backend
+  only).
 
 Deprecated Compiler Flags
 -------------------------
@@ -279,6 +282,11 @@
   GNU driver. Programs that depend on clang invoking GCC as the linker driver
   should use GCC as the linker in the build system.
 
+- The ``-mbranch-protection`` flag will now also work for the ARM backend.
+
+- The ``attribute((target("branch-protection=...)))`` attributes will now also
+  work for the ARM backend.
+
 Floating Point Support in Clang
 -------------------------------
 - The default setting of FP contraction (FMA) is now -ffp-contract=on (for