diff --git a/src/paveit/datamodels/norm_specification.py b/src/paveit/datamodels/norm_specification.py
index 03d4080..bf28d06 100644
--- a/src/paveit/datamodels/norm_specification.py
+++ b/src/paveit/datamodels/norm_specification.py
@@ -35,6 +35,9 @@ class BitumenParameterTLBitumen2013Strassenbaubitumen(EnumerateBase):
 
 class BitumenParameterLimitsTLBitumen2013Strassenbaubitumen(EnumerateBase):
     
+    name = StringField()
+    category = EnumField(BitumenCategoryEnum, required=True)
+    
     penetration_norm = EnumField(NormEnum, default=NormEnum.DINEN1426)
     penetration_unit = StringField('0.1 mm')
     penetration_operator = EnumField(RelationalOperatorsEnum, default=RelationalOperatorsEnum.between)