diff --git a/doc/src/LectureNotes/_toc.yml b/doc/src/LectureNotes/_toc.yml
index 7127e3995..29ab52b38 100644
--- a/doc/src/LectureNotes/_toc.yml
+++ b/doc/src/LectureNotes/_toc.yml
@@ -1,5 +1,5 @@
-- file: intro
+file: markdown
+sections:
 - file: content
-  sections:
-    - file: markdown
-    - file: notebooks
+- file: intro
+- file: notebooks