diff --git a/src/Controller/CommerceOrderPdfController.php b/src/Controller/CommerceOrderPdfController.php
index e66f2fe..c7be82d 100755
--- a/src/Controller/CommerceOrderPdfController.php
+++ b/src/Controller/CommerceOrderPdfController.php
@@ -18,8 +18,8 @@ class CommerceOrderPdfController extends ControllerBase {
   /**
    * Print_invoice.
    *
-   * @return string
-   *   Return Hello string.
+   * @return PDF
+   *   Return pdf of order invoice.
    */
   public function print_invoice($commerce_order_id) {
     $commerce_order_id = \Drupal::routeMatch()->getParameter('commerce_order_id');