diff --git a/docs/_includes/head-custom.html b/docs/_includes/head-custom.html
new file mode 100644
index 00000000..c63b9581
--- /dev/null
+++ b/docs/_includes/head-custom.html
@@ -0,0 +1 @@
+<img referrerpolicy="no-referrer-when-downgrade" src="https://static.scarf.sh/a.png?x-pxid=bd8914ff-fcda-4c0c-ab57-6fc671ae6cff" style="display:none;" />