diff --git a/_quarto.yml b/_quarto.yml
index 4e2570e..cf4fb36 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -27,6 +27,7 @@ format:
       - brand
     link-external-icon: true
     link-external-newwindow: true
+    link-external-filter: ^(?:http:|https:)\/\/pages\.spacilovi\.eu\/david-spacil\/help
     css: styles.css
     toc: true