diff --git a/src/test/resources/epub3/05-package-document/files/collection-role-url-valid.opf b/src/test/resources/epub3/05-package-document/files/collection-role-url-valid.opf
index 9d57e9079..5726de944 100644
--- a/src/test/resources/epub3/05-package-document/files/collection-role-url-valid.opf
+++ b/src/test/resources/epub3/05-package-document/files/collection-role-url-valid.opf
@@ -17,11 +17,15 @@
         <link href="http://example.org/resource"/>
     </collection>
     <collection role="http://idpf.org.example.org/">
-        <!-- using 'idpf.org' in the URL authority was forbidden in EPUB 3.2 -->
+        <!-- collection role requirements are no longer checked,
+             so using 'idpf.org' in the URL authority (forbidden in EPUB 3.2)
+             is considered valid -->
         <link href="http://example.org/resource"/>
     </collection>
     <collection role="unknown-token">
-        <!-- using roles not in the role vocab was forbidden in EPUB 3.2 -->
+        <!-- collection role requirements are no longer checked,
+             so using an unknown token (forbidden in EPUB 3.2)
+             is considered valid -->
         <link href="http://example.org/resource"/>
     </collection>
 </package>