diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index d99a12e26a3db30a009b4f06f1dd686d77e6141c..d541b6e15a56f6aec8c10bff0045e107a752bf28 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -70,6 +70,9 @@ debugger. Clang supports tuning for three debuggers, as follows.
 
 Specifying ``-g`` without a tuning option will use a target-dependent default.
 
+The new ``-fstrict-vtable-pointers`` flag enables better devirtualization
+support (experimental).
+
 
 New Pragmas in Clang
 -----------------------