diff --git a/docs/index.html b/docs/index.html
index 6bd138e..9a45e2e 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -117,3 +117,9 @@ <h4>Tree</h4>
   src="https://code.jquery.com/jquery-3.3.1.min.js"
   crossorigin="anonymous">
 </script>
+<script>
+  let select = document.getElementById('language-select')
+  select.value = 'yaml'
+  select.dispatchEvent(new Event('change'))
+</script>
+