diff --git a/includes/admin/reports/class-wc-admin-report.php b/includes/admin/reports/class-wc-admin-report.php
index 3ffcf8bbbeb..9b48fc90fbb 100644
--- a/includes/admin/reports/class-wc-admin-report.php
+++ b/includes/admin/reports/class-wc-admin-report.php
@@ -32,7 +32,7 @@ class WC_Admin_Report {
 	 * )
 	 *
 	 * @param  array $args
-	 * @return array of results
+	 * @return array|string depending on query_type
 	 */
 	public function get_order_report_data( $args = array() ) {
 		global $wpdb;