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diff --git a/ChangeLog b/ChangeLog
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 Thu May 13 12:53:13 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* io.c (swallow): support text mode and UTF-16/32 as internal encoding.
+	  [Bug #1576]
 
 	* io.c (io_shift_cbuf): read and throw it away when str is NULL.