diff --git a/ChangeLog b/ChangeLog
index 82e2ee64a5..c29a27ca72 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Feb  1 21:26:41 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* lib/matrix.rb (Vector#each2): returns a self.  [ruby-dev:40241]
+
 Mon Feb  1 17:08:42 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* numeric.c (flo_minus): RDoc update.  a patch from red stun
diff --git a/lib/matrix.rb b/lib/matrix.rb
index e6f5fe107c..d452bf459e 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1149,6 +1149,7 @@ class Vector
     size.times do |i|
       yield @elements[i], v[i]
     end
+    self
   end
 
   #