diff --git a/README.md b/README.md
index 0780e3d..a317149 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ import { gallery } from '@advdominion/lightbox-gallery';
 gallery(document.querySelector('#list'), {
     single: false,
     swiper: {
-        speed: duration.effect.s,
+        speed: 300,
         pagination: {
             el: '.swiper-pagination',
         },