diff --git a/NEWS b/NEWS
index 4d70c1f45c..12df4d201e 100644
--- a/NEWS
+++ b/NEWS
@@ -64,3 +64,4 @@ with all sufficient information, see the ChangeLog file.
   rb_gc_set_params : internal function. no replacement.
 
 * struct RBignum is hidden.  [Feature #6083]
+  Use rb_integer_pack and rb_integer_unpack instead.