diff --git a/xNet/~Http/HttpStatusCode.cs b/xNet/~Http/HttpStatusCode.cs
index cdc1521..679ea3b 100644
--- a/xNet/~Http/HttpStatusCode.cs
+++ b/xNet/~Http/HttpStatusCode.cs
@@ -51,6 +51,11 @@ public enum HttpStatusCode
         UnsupportedMediaType = 415,
         RequestedRangeNotSatisfiable = 416,
         ExpectationFailed = 417,
+        UpgradeRequired = 426,
+        PreconditionRequired = 428,
+        TooManyRequests = 429,
+        RequestHeaderFieldsTooLarge = 431,
+        UnavailableForLegalReasons = 451,
 
         InternalServerError = 500,
         NotImplemented = 501,
@@ -58,5 +63,6 @@ public enum HttpStatusCode
         ServiceUnavailable = 503,
         GatewayTimeout = 504,
         HttpVersionNotSupported = 505,
+        NetworkAuthenticationRequired = 511,
     }
 }
\ No newline at end of file