diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index c049638e0d..db38c6d65d 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -994,6 +994,7 @@ function get_status_header_desc( $code ) {
 			305 => 'Use Proxy',
 			306 => 'Reserved',
 			307 => 'Temporary Redirect',
+			308 => 'Permanent Redirect',
 
 			400 => 'Bad Request',
 			401 => 'Unauthorized',
@@ -1014,6 +1015,7 @@ function get_status_header_desc( $code ) {
 			416 => 'Requested Range Not Satisfiable',
 			417 => 'Expectation Failed',
 			418 => 'I\'m a teapot',
+			421 => 'Misdirected Request',
 			422 => 'Unprocessable Entity',
 			423 => 'Locked',
 			424 => 'Failed Dependency',