diff --git a/ChangeLog b/ChangeLog
index 04696c1ba4..ac455215ed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Feb  2 21:04:13 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* array.c (rb_ary_sort_by_bang): RDoc update.  [ruby-core:21742]
+
 Mon Feb  2 20:49:24 2009  Akinori MUSHA  <knu@iDaemons.org>
 
 	* enumerator.c: Introduce id_each to save rb_itern() and SYM2ID()
diff --git a/array.c b/array.c
index 17f5e6119b..59e3fa737e 100644
--- a/array.c
+++ b/array.c
@@ -1851,7 +1851,7 @@ sort_by_i(VALUE i)
 
 /*
  *  call-seq:
- *     enum.sort_by! {| obj | block }    -> array
+ *     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.