diff --git a/ChangeLog b/ChangeLog
index 78a2fe4253..e71e9f9fd9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Mon Dec  9 02:10:32 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/net/http/responses.rb:
+	  Add `HTTPIMUsed`, as it is also supported by rack/rails.
+	  RFC - http://tools.ietf.org/html/rfc3229
+	  by Vipul A M <vipulnsward@gmail.com>
+	  https://github.com/ruby/ruby/pull/447 fix GH-447
+
 Sun Dec  8 20:47:35 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* class.c (rb_get_kwargs): when values is non-null, remove
diff --git a/lib/net/http.rb b/lib/net/http.rb
index 44c123b0e3..a1b8d691bb 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -334,6 +334,7 @@ module Net   #:nodoc:
   #   HTTPResetContent::                    205
   #   HTTPPartialContent::                  206
   #   HTTPMultiStatus::                     207
+  #   HTTPIMUsed::                          226
   # HTTPRedirection::                    3xx
   #   HTTPMultipleChoices::                 300
   #   HTTPMovedPermanently::                301
diff --git a/lib/net/http/responses.rb b/lib/net/http/responses.rb
index 38a5da2443..bc7642c7f3 100644
--- a/lib/net/http/responses.rb
+++ b/lib/net/http/responses.rb
@@ -57,7 +57,9 @@ class Net::HTTPMultiStatus < Net::HTTPSuccess                   # 207 - RFC 4918
   HAS_BODY = true
 end
 # 208 Already Reported - RFC 5842; experimental
-# 226 IM Used - RFC 3229; no famous implementation known
+class Net::HTTPIMUsed < Net::HTTPSuccess                        # 226 - RFC 3229
+  HAS_BODY = true
+end
 
 class Net::HTTPMultipleChoices < Net::HTTPRedirection    # 300
   HAS_BODY = true
@@ -218,6 +220,7 @@ class Net::HTTPResponse
     '205' => Net::HTTPResetContent,
     '206' => Net::HTTPPartialContent,
     '207' => Net::HTTPMultiStatus,
+    '226' => Net::HTTPIMUsed,
 
     '300' => Net::HTTPMultipleChoices,
     '301' => Net::HTTPMovedPermanently,