diff --git a/ChangeLog b/ChangeLog
index 84e813d4ec..e07c775e4d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Dec 24 05:32:22 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* enum.c (enum_inject): updated documentation.  a patch from Keita
+	  Yamaguchi <keita.yamaguchi@gmail.com> in [ruby-dev:32686].
+
 Mon Dec 24 05:13:04 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* string.c (tr_trans): should associate new encoding if modified.
diff --git a/enum.c b/enum.c
index e817283b21..6cca130fe9 100644
--- a/enum.c
+++ b/enum.c
@@ -370,12 +370,12 @@ inject_op_i(VALUE i, VALUE p)
 
 /*
  *  call-seq:
- *     enum.inject(sym, initial) => obj
+ *     enum.inject(initial, sym) => obj
  *     enum.inject(sym)          => obj
  *     enum.inject(initial) {| memo, obj | block }  => obj
  *     enum.inject          {| memo, obj | block }  => obj
  *
- *     enum.reduce(sym, initial) => obj
+ *     enum.reduce(initial, sym) => obj
  *     enum.reduce(sym)          => obj
  *     enum.reduce(initial) {| memo, obj | block }  => obj
  *     enum.reduce          {| memo, obj | block }  => obj
@@ -403,7 +403,7 @@ inject_op_i(VALUE i, VALUE p)
  *     # Same using a block and inject
  *     (5..10).inject {|sum, n| sum + n }            #=> 45
  *     # Multiply some numbers
- *     (5..10).reduce(:*, 1)                         #=> 151200
+ *     (5..10).reduce(1, :*)                         #=> 151200
  *     # Same using a block
  *     (5..10).inject(1) {|product, n| product * n } #=> 151200
  *     # find the longest word