diff --git a/config.ttl b/config.ttl
index 20b0dd0..1a577f6 100644
--- a/config.ttl
+++ b/config.ttl
@@ -85,4 +85,6 @@
           text:predicate rdfs:label ]
         [ text:field "prefLabel" ;
           text:predicate skos:prefLabel ]
+        [ text:field "identifier" 
+          text:predicate sdo:identifier ]
     ) .
\ No newline at end of file