diff --git a/ChangeLog b/ChangeLog
index 8dffe33daf..342d5a2adf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Feb  3 16:36:06 2009  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
+
+	* array.c (rb_ary_sort_by_bang): RDoc update.
+
+	* NEWS: add Array#sort_by!.
+
 Tue Feb  3 16:23:16 2009  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/lib/socket.rb (Socket.tcp_server_sockets_port0): new
diff --git a/NEWS b/NEWS
index 89b975baa1..635111abf7 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,9 @@ with all sufficient information, see the ChangeLog file.
 
 * builtin classes
 
+  * Array
+    * Array#sort_by!
+
   * IO
     * IO.pipe takes a block.
 
diff --git a/array.c b/array.c
index 59e3fa737e..13bf3b674e 100644
--- a/array.c
+++ b/array.c
@@ -1853,8 +1853,8 @@ sort_by_i(VALUE i)
  *  call-seq:
  *     array.sort_by! {| obj | block }    -> array
  *
- *  Sorts <i>enum</i> in place using a set of keys generated by mapping the
- *  values in <i>enum</i> through the given block.
+ *  Sorts <i>array</i> in place using a set of keys generated by mapping the
+ *  values in <i>array</i> through the given block.
  */
 
 static VALUE