diff --git a/apis_ontology/models.py b/apis_ontology/models.py
index 44cd792..5dd0748 100644
--- a/apis_ontology/models.py
+++ b/apis_ontology/models.py
@@ -16,6 +16,7 @@ class LegacyStuffMixin(models.Model):
     published = models.BooleanField(default=False)
 
     texts = GenericRelation("Text")
+    source = GenericRelation("Source")
 
     class Meta:
         abstract = True