diff --git a/migration/tables/content_items.py b/migration/tables/content_items.py
index 707b9326..3adfebcd 100644
--- a/migration/tables/content_items.py
+++ b/migration/tables/content_items.py
@@ -90,7 +90,11 @@ def migrate(entry, users_by_oid, topics_by_oid):
 		# print(entry)
 		raise Exception
 
-	topic_oids = set(entry['category'])
+	category = entry['category']
+	mainTopic = topics_by_oid.get(category)
+	if mainTopic:
+		r['mainTopic'] = mainTopic["slug"]
+	topic_oids = set(category)
 	topic_oids.update(entry.get("tags", []))
 	for oid in topic_oids:
 		if oid in topics_by_oid:
diff --git a/orm/shout.py b/orm/shout.py
index 223579a1..58d35edf 100644
--- a/orm/shout.py
+++ b/orm/shout.py
@@ -293,4 +293,5 @@ class Shout(Base):
 	layout: str = Column(String, nullable = True)
 	authors = relationship(lambda: User, secondary=ShoutAuthor.__tablename__) # NOTE: multiple authors
 	topics = relationship(lambda: Topic, secondary=ShoutTopic.__tablename__)
+	mainTopic = Column(ForeignKey("topic.slug"), nullable=True)
 	visibleFor = relationship(lambda: User, secondary=ShoutViewer.__tablename__)