diff --git a/src/wp-includes/class-wp-xmlrpc-server.php b/src/wp-includes/class-wp-xmlrpc-server.php
index 08897dc032..4222f9aca0 100644
--- a/src/wp-includes/class-wp-xmlrpc-server.php
+++ b/src/wp-includes/class-wp-xmlrpc-server.php
@@ -188,6 +188,9 @@ class wp_xmlrpc_server extends IXR_Server {
 	}
 
 	/**
+	 * Serves the XML-RPC request.
+	 *
+	 * @since 2.9.0
 	 * @access public
 	 */
 	public function serve_request() {