diff -r 75dc64c8c22b Doc/library/http.rst
--- a/Doc/library/http.rst	Wed Jun 01 08:17:27 2016 +0000
+++ b/Doc/library/http.rst	Wed Jun 01 13:06:44 2016 -0400
@@ -103,6 +103,7 @@
 ``428`` ``PRECONDITION_REQUIRED``           Additional HTTP Status Codes :rfc:`6585`
 ``429`` ``TOO_MANY_REQUESTS``               Additional HTTP Status Codes :rfc:`6585`
 ``431`` ``REQUEST_HEADER_FIELDS_TOO_LARGE`` Additional HTTP Status Codes :rfc:`6585`
+``451`` ``UNAVAILABLE_FOR_LEGAL_REASONS``   Status Code to Report Legal Obstacles :rfc:`7725`
 ``500`` ``INTERNAL_SERVER_ERROR``           HTTP/1.1 :rfc:`7231`, Section 6.6.1
 ``501`` ``NOT_IMPLEMENTED``                 HTTP/1.1 :rfc:`7231`, Section 6.6.2
 ``502`` ``BAD_GATEWAY``                     HTTP/1.1 :rfc:`7231`, Section 6.6.3
@@ -120,3 +121,6 @@
 in the :mod:`http.client` module in the form of constants. The enum name is
 equal to the constant name (i.e. ``http.HTTPStatus.OK`` is also available as
 ``http.client.OK``).
+
+.. versionadded:: 3.6
+   Status code 451.