Update core/rio/api/src/main/java/org/eclipse/rdf4j/rio/helpers/RDFaParserSettings.java

Author: edwardsph

core/rio/api/src/main/java/org/eclipse/rdf4j/rio/helpers/RDFaParserSettings.java

@@ -23,6 +23,8 @@ public class RDFaParserSettings {
 
 	/**
 	 * Boolean setting for parser to determine the RDFa version to use when processing the document.
+         * Note that although these settings are not used within RDF4J, they are in use by external plugins.
+         * @see <a href="https://github.com/eclipse-rdf4j/rdf4j/issues/4779">https://github.com/eclipse-rdf4j/rdf4j/issues/4779</a>
 	 * <p>
 	 * Defaults to {@link RDFaVersion#RDFA_1_0}.
 	 */