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index b562ea1a836..947d0074f98 100644
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+++ b/NEWS
@@ -123,6 +123,7 @@ with all sufficient information, see the ChangeLog file or Redmine
So obj.kind_of?(Fixnum) works as obj.kind_of?(Integer).
At C-level, Fixnum object and Bignum object should be distinguished by
FIXNUM_P(obj) and RB_TYPE_P(obj, T_BIGNUM).
+ RUBY_INTEGER_UNIFICATION can be used to detect this feature.
ruby-2.4.0-preview1 (temporally) removes rb_cFixnum and rb_cBignum
to check the effect of incompatibility.
(rb_cFixnum and rb_cBignum may be defined as rb_cInteger later if