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diff --git a/ChangeLog b/ChangeLog
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--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Nov  6 23:58:40 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* pack.c (pack_pack): escape unprintable characters and preserve
+	  the encoding of warning message.
+
 Thu Nov  6 23:55:18 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (sym_printable): QUOTE() should not raise an exception