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diff --git a/ChangeLog b/ChangeLog
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+Sat Oct  1 00:55:19 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* io.c (nogvl_fsync, nogvl_fdatasync): on Windows, just ignore if the
+	  fd is associated to non-disk device.  if call fsync and/or fdatasync
+	  with such fds, it causes Errno::EBADF exception and the behavior is
+	  incompatible with ruby 2.1 and earlier unintentionally introduced.
+
 Sat Oct  1 00:53:28 2016  Kazuki Tsujimoto  <kazuki@callcc.net>
 
 	* array.c (flatten): use rb_obj_class instead of rb_class_of