diff --git a/qudt/ontology/qudt.py b/qudt/ontology/qudt.py
index 0181327..9555631 100644
--- a/qudt/ontology/qudt.py
+++ b/qudt/ontology/qudt.py
@@ -41,3 +41,4 @@ class QUDT(object):
     LIQUID_VOLUME = OntologyUtils.get_iri('kind', 'LiquidVolume')
     VOLUME_FLOW_RATE = OntologyUtils.get_iri('kind', 'VolumeFlowRate')
     IONIZATION_ENERGY = OntologyUtils.get_iri('kind', 'IonizationEnergy')
+    HEAT_CAPACITY = OntologyUtils.get_iri('kind', 'HeatCapacity')
diff --git a/qudt/ontology/resources/v2_1_4/VOCAB_QUDT-UNITS-ALL-v2.1.ttl b/qudt/ontology/resources/v2_1_4/VOCAB_QUDT-UNITS-ALL-v2.1.ttl
index 05ac1a8..4452ef5 100644
--- a/qudt/ontology/resources/v2_1_4/VOCAB_QUDT-UNITS-ALL-v2.1.ttl
+++ b/qudt/ontology/resources/v2_1_4/VOCAB_QUDT-UNITS-ALL-v2.1.ttl
@@ -9260,6 +9260,7 @@ unit:KiloJ-PER-KiloGM
   qudt:conversionMultiplier 1e+03 ;
   qudt:conversionOffset 0e+00 ;
   qudt:hasQuantityKind quantitykind:HeatCapacity ;
+  qudt:hasQuantityKind quantitykind:SpecificEnergy ;
   qudt:iec61360Code "0112/2///62720#UAA570" ;
   qudt:plainTextDescription "1 000-fold of the SI derived unit joule divided by the SI base unit kilogram" ;
   qudt:uneceCommonCode "B42" ;
diff --git a/qudt/ontology/unit_factory.py b/qudt/ontology/unit_factory.py
index 62b0e56..fc33745 100644
--- a/qudt/ontology/unit_factory.py
+++ b/qudt/ontology/unit_factory.py
@@ -276,6 +276,7 @@ def _should_be_ignored(type_iri: str) -> bool:
             QUDT.LIQUID_VOLUME,
             QUDT.VOLUME_FLOW_RATE,
             QUDT.IONIZATION_ENERGY,
+            QUDT.HEAT_CAPACITY,
         ]:
             return True