diff --git a/.lycheeignore b/.lycheeignore
index 4b91669d0..8a0f3c7dd 100644
--- a/.lycheeignore
+++ b/.lycheeignore
@@ -4,4 +4,5 @@ https://nuxt.com/docs/guide/directory-structure/pages
 https://github.com/shopware/shopware/blob/trunk/src/Core/Content/Test/Product/SalesChannel/Listing/CachedProductListingRouteTest.php
 https://github.com/shopware/shopware/blob/trunk/src/Core/Content/Test/Product/Cart/ProductCartTest.php
 https://github.com/shopware/shopware/blob/6.4.17.0/src/Core/Framework/Update/Services/UpdateHtaccess.php
-https://github.com/shopware/shopware/blob/trunk/src/Core/Checkout/Customer/Rule/IsNewCustomerRule.php
\ No newline at end of file
+https://github.com/shopware/shopware/blob/trunk/src/Core/Checkout/Customer/Rule/IsNewCustomerRule.php
+https://www.tim-wellhausen.de/papers/ExpandAndContract/ExpandAndContract.html
\ No newline at end of file