diff --git a/source/Ox/js/String.js b/source/Ox/js/String.js
index 35306b3c..76810a85 100644
--- a/source/Ox/js/String.js
+++ b/source/Ox/js/String.js
@@ -364,6 +364,8 @@ Ox.parseUserAgent = function(userAgent) {
                 'NT 6.0': 'NT 6.0 (Windows Vista)',
                 'NT 6.1': 'NT 6.1 (Windows 7)',
                 'NT 6.2': 'NT 6.2 (Windows 8)',
+                'NT 6.3': 'NT 6.3 (Windows 8.1)',
+                'NT 6.4': 'NT 6.4 (Windows 10)',
                 '95': 'NT 4.0 (Windows 95)',
                 'NT': 'NT 4.0 (Windows NT)',
                 '98': 'NT 4.1 (Windows 98)',