diff --git a/doi2dataset.py b/doi2dataset.py
index 02fa6bd..683f4dc 100755
--- a/doi2dataset.py
+++ b/doi2dataset.py
@@ -1045,8 +1045,15 @@ class CitationBuilder:
 
         for topic in self.data.get("topics", []):
             if topic.get("score") >= 0.8:
-                if name := topic.get("display_name"):
-                    topics.append([PrimitiveMetadataField("topicClassValue", False, name)])
+
+                topic_class_value_field = PrimitiveMetadataField("topicClassValue",
+                    False, topic.get("display_name"))
+                topic_class_vocab_field = PrimitiveMetadataField("topicClassVocab",
+                    False, "OpenAlex")
+                topic_class_vocab_uri_field = PrimitiveMetadataField(
+                    "topicClassVocabURI", False, topic.get("id"))
+
+                topics.append([topic_class_value_field, topic_class_vocab_field, topic_class_vocab_uri_field])
 
         return topics