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diff --git a/ChangeLog b/ChangeLog
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+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Sun Oct 22 16:47:56 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* string.c (rb_str_substr): should be infected with only original
+	  string, but not the shared string.  fixed: [ruby-core:09152]
+
+	* strnig.c (rb_str_new4): keep shared string untainted when orignal
+	  string is tainted.  fixed: [ruby-dev:29672]
+
 Fri Oct 20 10:47:43 2006  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* lib/mkmf.rb: fixed the bug of handling COMMON_MACROS.