diff --git a/ChangeLog b/ChangeLog
index 44c8fe590c..18b5819752 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,7 @@
 Thu Dec 27 21:47:04 2007  NAKAMURA Usaku  <usa@ruby-lang.org>
 
-	* mkconfig.rb (prefix): archdir is "1.9.0", not "1.9".
+	* mkconfig.rb (prefix): archdir is "1.9.0", not "1.9". reported in
+	  <http://slashdot.jp/developers/comments.pl?sid=384937&cid=1273085>.
 
 Thu Dec 27 17:57:30 2007  Tanaka Akira  <akr@fsij.org>