diff --git a/ChangeLog b/ChangeLog
index ad4aee2990..552166b41c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Jul  9 17:24:41 2011  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* NEWS: bigdecimal is not a builtin.
+
 Sat Jul  9 17:17:53 2011  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* ext/date/date_core.c: some improvements for performance.
diff --git a/NEWS b/NEWS
index 1bd986f8cc..027cbd20c9 100644
--- a/NEWS
+++ b/NEWS
@@ -101,14 +101,14 @@ with all sufficient information, see the ChangeLog file.
     * Process#maxgroups and Process#maxgroups= now raise NotImplementedError if
       the platform don't support supplementary groups concept.
 
-  * bigdecimal
-    * Kernel.BigDecimal and BigDecimal.new now accept instances of Integer,
-      Rational, and Float.  If you pass a Rational or a Float to them, you must
-      specify the precision to produce the digits of a BigDecimal.
+* bigdecimal
+  * Kernel.BigDecimal and BigDecimal.new now accept instances of Integer,
+    Rational, and Float.  If you pass a Rational or a Float to them, you must
+    specify the precision to produce the digits of a BigDecimal.
 
-    * The behavior of BigDecimal#coerce with a Rational is changed.  It uses
-      the precision of the receiver BigDecimal to produce the digits of a
-      BigDecimal from the given Rational.
+  * The behavior of BigDecimal#coerce with a Rational is changed.  It uses
+    the precision of the receiver BigDecimal to produce the digits of a
+    BigDecimal from the given Rational.
 
 * date