diff --git a/ruby/README b/ruby/README
index 859ae2b..051a769 100644
--- a/ruby/README
+++ b/ruby/README
@@ -1,29 +1,37 @@
 
 = MessagePack
 
-
 == Description
 
+MessagePack is a binary-based efficient object serialization library.
+It enables to exchange structured objects between many languages like JSON.
+But unlike JSON, it is very fast and small.
+
+Simple usage is as follows:
+
+  require 'msgpack'
+  msg = [1,2,3].to_msgpack  #=> "\x93\x01\x02\x03"
+  MessagePack.unpack(msg)   #=> [1,2,3]
+
+Use MessagePack::Unpacker for streaming deserialization.
+
 
 == Installation
 
 === Archive Installation
 
-	rake install
+  ruby extconf.rb
+  make
+  make install
 
 === Gem Installation
 
-	gem install msgpack
-
-
-== Features/Problems
-
-
-== Synopsis
+  gem install msgpack
 
 
 == Copyright
 
 Author::    frsyuki <frsyuki@users.sourceforge.jp>
-Copyright:: Copyright (c) 2008-2009 frsyuki
+Copyright:: Copyright (c) 2008-2010 FURUHASHI Sadayuki
 License::   Apache License, Version 2.0
+
diff --git a/ruby/msgpack.gemspec b/ruby/msgpack.gemspec
index c5e8c8c..0f08628 100644
--- a/ruby/msgpack.gemspec
+++ b/ruby/msgpack.gemspec
@@ -1,14 +1,14 @@
 Gem::Specification.new do |s|
   s.platform = Gem::Platform::RUBY
   s.name = "msgpack"
-  s.version = "0.3.9"
+  s.version = "0.4.0"
   s.summary = "MessagePack, a binary-based efficient data interchange format."
   s.author = "FURUHASHI Sadayuki"
   s.email = "frsyuki@users.sourceforge.jp"
   s.homepage = "http://msgpack.sourceforge.net/"
   s.rubyforge_project = "msgpack"
-  s.has_rdoc = false
-  s.extra_rdoc_files = ["README", "ChangeLog", "AUTHORS"]
+  s.has_rdoc = true
+	s.rdoc_options = ["ext"]
   s.require_paths = ["lib"]
   s.files = Dir["ext/**/*", "msgpack/**/*", "test/**/*"]
   s.test_files = Dir["test/test_*.rb"]
diff --git a/ruby/pack.h b/ruby/pack.h
index c9b08a4..f162a86 100644
--- a/ruby/pack.h
+++ b/ruby/pack.h
@@ -1,7 +1,7 @@
 /*
  * MessagePack for Ruby packing routine
  *
- * Copyright (C) 2008-2009 FURUHASHI Sadayuki
+ * Copyright (C) 2008-2010 FURUHASHI Sadayuki
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
diff --git a/ruby/rbinit.c b/ruby/rbinit.c
index 4ad6beb..ad51f6b 100644
--- a/ruby/rbinit.c
+++ b/ruby/rbinit.c
@@ -1,7 +1,7 @@
 /*
  * MessagePack for Ruby
  *
- * Copyright (C) 2008-2009 FURUHASHI Sadayuki
+ * Copyright (C) 2008-2010 FURUHASHI Sadayuki
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -31,7 +31,7 @@ static VALUE mMessagePack;
  *
  *   gem install msgpack
  *
- * Simple usage is as follows.
+ * Simple usage is as follows:
  *
  *   require 'msgpack'
  *   msg = [1,2,3].to_msgpack  #=> "\x93\x01\x02\x03"
diff --git a/ruby/unpack.h b/ruby/unpack.h
index ce2a8de..91d3eb7 100644
--- a/ruby/unpack.h
+++ b/ruby/unpack.h
@@ -1,7 +1,7 @@
 /*
  * MessagePack for Ruby unpacking routine
  *
- * Copyright (C) 2008-2009 FURUHASHI Sadayuki
+ * Copyright (C) 2008-2010 FURUHASHI Sadayuki
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.