diff --git a/book/_toc.yml b/book/_toc.yml
index f87daa6..0665212 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -86,6 +86,7 @@ parts:
         sections:
         - file: features/widgets.ipynb
         - file: features/exercise_checking.ipynb
+      - file: features/Jessyink
       - file: external/sphinx-iframes/README.md
       - file: external/Sphinx-PRIME-applets/README.md
     - file: features/visuals.md