diff --git a/src/paveit/datamodels/material.py b/src/paveit/datamodels/material.py
index beb1a41..8876d43 100755
--- a/src/paveit/datamodels/material.py
+++ b/src/paveit/datamodels/material.py
@@ -73,6 +73,8 @@ class BitumenParameterStrassenbaubitumen(Material):
 
 class Bitumen(Material):
     name = StringField()
+    producer = StringField()
+    batch_number = StringField()
     
     category = EnumField(BitumenCategoryEnum, required=True)
     norm = EnumField(NormEnum, default=NormEnum.TLBitumen2019)