diff --git a/ontology/saref4grid.ttl b/ontology/saref4grid.ttl
index 34af1e4cbb7021c9d5593596cdfebc8f0ab161f5..0fc44fa0d2a34a529cda7881eb69b3576dc76109 100644
--- a/ontology/saref4grid.ttl
+++ b/ontology/saref4grid.ttl
@@ -22,6 +22,7 @@
     owl:versionInfo "v1.1.1" ;
 	dcterms:license <https://forge.etsi.org/etsi-software-license> ;
 	dcterms:source <https://saref.etsi.org/sources/saref4grid/> ;
+	rdfs:seeAlso <https://www.etsi.org/deliver/etsi_ts/103400_103499/10341012/01.01.01_60/ts_10341012v010101p.pdf> ;
 	dcterms:issued "2023-11-22"^^xsd:date ;
     dcterms:modified "2023-11-22"^^xsd:date ;
 	vann:preferredNamespacePrefix "s4grid" ;