diff --git a/objects/mediahaven.rdfs.ttl b/objects/mediahaven.rdfs.ttl
index 7c7f45f..1124e65 100644
--- a/objects/mediahaven.rdfs.ttl
+++ b/objects/mediahaven.rdfs.ttl
@@ -3,6 +3,7 @@
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 @prefix skos: <http://www.w3.org/2004/02/skos/core#> .
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+@prefix org: <http://www.w3.org/ns/org#> . # Core organization ontology
 
 # Classes