diff --git a/book/_toc.yml b/book/_toc.yml
index 8a2321d..8e5d4c8 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -7,5 +7,6 @@ parts:
     - file: some_content/overview.md
       sections:
       - file: some_content/text_and_code.ipynb
+      - file: some_content/HTML_elements.md
     - file: references.md
-    - file: credits.md
\ No newline at end of file
+    - file: credits.md