diff --git a/src/common/getVisibleChildrenRange.js b/src/common/getVisibleChildrenRange.js
index 8e32374f4..f389349e6 100644
--- a/src/common/getVisibleChildrenRange.js
+++ b/src/common/getVisibleChildrenRange.js
@@ -1,3 +1,5 @@
+// Copyright (C) 2017-2022 Smart code 203358507
+
 const isChildVisible = (container, element, threshold) => {
     const elementTop = element.offsetTop;
     const elementBottom = element.offsetTop + element.clientHeight;