diff --git a/book/_toc.yml b/book/_toc.yml
index 561237f..6c408a7 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -4,6 +4,7 @@ root: intro
 parts:
   - caption: test sphinx_gated_directives
     chapters:
+    - external: https://github.com/TeachBooks/Sphinx-Gated-Directives/blob/main/MANUAL.md
     - file: instructie.ipynb
     - file: instructie_2.ipynb
     - file: lesoefeningen.ipynb
diff --git a/requirements.txt b/requirements.txt
index 1e0384a..946f15a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,8 @@
-teachbooks == 0.2.3
+# teachbooks == 0.2.3
+git+https://github.com/TeachBooks/TeachBooks@issue-127
 sphinx-inline-tabs
 
-git+https://github.com/TeachBooks/TeachBooks-Favourites #bump codex
+git+https://github.com/TeachBooks/TeachBooks-Favourites
 
 teachbooks-sphinx-grasple