Index: docs/UsersManual.rst
===================================================================
--- docs/UsersManual.rst
+++ docs/UsersManual.rst
@@ -1097,6 +1097,12 @@
    the behavior of sanitizers in the ``cfi`` group to allow checking
    of cross-DSO virtual and indirect calls.
 
+
+.. option:: -f[no-]strict-vtable-pointers
+   Enable optimizations based on the strict rules for overwriting polymorphic
+   C++ objects, e.g. vptr is invariant during the lifetime of object.
+   This enables better devirtualization. Turned off by default.
+
 .. option:: -ffast-math
 
    Enable fast-math mode. This defines the ``__FAST_MATH__`` preprocessor