diff --git a/src/MDMarkingTypesSet.php b/src/MDMarkingTypesSet.php
index e4c92e3..8c5abf2 100644
--- a/src/MDMarkingTypesSet.php
+++ b/src/MDMarkingTypesSet.php
@@ -17,7 +17,8 @@ class MDMarkingTypesSet {
         'scratch',
         'stamp',
         'overprint',
-        'embossing'
+        'embossing',
+        'handwritten',
     ];
 
 }