Index: ReleaseNotes.rst
===================================================================
--- ReleaseNotes.rst
+++ ReleaseNotes.rst
@@ -78,6 +78,12 @@
   when the signed integer is coerced to an unsigned type for the comparison.
   ``-Wsign-compare`` was adjusted not to warn in this case.
 
+- ``-Wnull-pointer-arithmetic`` now warns about performing pointer arithmetic
+  on a null pointer. It has an undefined behavior if the offset is nonzero.
+
+- ``-Wnull-pointer-arithmetic`` now warns about arithmetic on a null pointer
+  treated as a cast from integer to pointer (GNU extension).
+
 Non-comprehensive list of changes in this release
 -------------------------------------------------