diff --git a/emimin.ttl b/emimin.ttl
index 7b10f3c..2af4973 100644
--- a/emimin.ttl
+++ b/emimin.ttl
@@ -2,10 +2,13 @@
 @prefix rdf: <http://www.w3c.org/1999/02/22-rdf-syntax-ns#> .
 @prefix skos: <http://www.w3.org/2004/02/skos/core#> .
 @prefix dcterms: <http://purl.org/dc/terms/> .
+@prefix vann: <http://purl.org/vocab/vann/> .
 
 <> a skos:ConceptScheme ;
 skos:prefLabel "ktbl Emi vocabulary"@en, "ktbl Emi Vokabular"@de ;
-dcterms:title "Common metadata vocabulary for Emi and associated projects"@en .
+dcterms:title "Common metadata vocabulary for Emi and associated projects"@en ;
+vann:preferredNamespacePrefix "emimin" ;
+vann:preferredNamespaceUri "https://www.ktbl.de/emimin#" .
 
 <livestock_category> a skos:Concept ;
 skos:prefLabel "Livestock category"@en, "Tierart"@de ;