diff --git a/ChangeLog b/ChangeLog
index fab47c583e..d021e68f05 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -7,7 +7,7 @@ Mon Nov 29 18:31:31 2010  Martin Duerst  <duerst@it.aoyama.ac.jp>
 Mon Nov 29 14:31:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/win32.c (rb_w32_isatty): use GetConsoleMode() to determine the
-	  fd is console or not, just like rb_w32_write_console().
+	  fd is console or not, just like rb_w32_write_console(). [exprimental]
 
 Mon Nov 29 14:19:40 2010  NAKAMURA Usaku  <usa@ruby-lang.org>