diff --git a/docs/simplesamlphp-metadata-extensions-attributes.md b/docs/simplesamlphp-metadata-extensions-attributes.md
index aac564cea888853d3f5703295f60a4e81a0cd34f..a04aef7701a7266bec97f9731342355178b9d2e9 100644
--- a/docs/simplesamlphp-metadata-extensions-attributes.md
+++ b/docs/simplesamlphp-metadata-extensions-attributes.md
@@ -118,7 +118,7 @@ entity category support for a service provider in `authsources.php`:
         ...
         'EntityAttributes' => [
             'http://macedir.org/entity-category' => [
-                'http://www.geant.net/uri/dataprotection-code-of-conduct/v1'
+                '{urn:oasis:names:tc:SAML:2.0:attrname-format:uri}http://www.geant.net/uri/dataprotection-code-of-conduct/v1'
             ]
         ],
         'UIInfo' =>[