diff --git a/source/contrib/index.md b/source/contrib/index.md
index 01d2052a..a7035b5a 100644
--- a/source/contrib/index.md
+++ b/source/contrib/index.md
@@ -32,16 +32,17 @@ and Python scripts and utilities.
 - Help {doc}`translate<translate>` Avogadro into your language.
 - [Donate financially](https://opencollective.com/open-chemistry) to pay for server hosting, user meetings, and bug bounties.
 
-```{toctree}
+:::{toctree}
 ---
 caption: Contributing
 hidden: true
 ---
 
+Introduction <self>
 credits
 translate
 code
-```
+:::
 
 [avogadro forum]: https://discuss.avogadro.cc
 [github tracker]: https://github.com/OpenChemistry/avogadrolibs/issues
diff --git a/source/develop/index.md b/source/develop/index.md
index a64fd525..8b3ec203 100644
--- a/source/develop/index.md
+++ b/source/develop/index.md
@@ -65,15 +65,15 @@ If you wish to extend Avogadro the main base classes are:
 
 Many examples of each can be found in the `avogadro/qtplugins/` subdirectories.
 
-```{toctree}
+:::{toctree}
 ---
 caption: Develop
 maxdepth: 2
 hidden: true
 ---
-self
+Introduction <self>
 build
 scripts/index
 rpc
 classlist
-```
+:::
diff --git a/source/teach/index.md b/source/teach/index.md
index b8753eb6..51bcf7d8 100644
--- a/source/teach/index.md
+++ b/source/teach/index.md
@@ -64,12 +64,13 @@ Beyond published articles, we include a variety of activities contributed by the
 
 * Investigate the pH-dependent protonation of amino acids.
 
-```{toctree}
+:::{toctree}
 ---
 caption: Teach
 hidden: true
 ---
 
+Introduction <self>
 articles
 diaxial_interactions
 acid_base
@@ -81,7 +82,7 @@ hydrogen_molecule
 markovnikovs_rule
 organic_hybridization
 water
-```
+:::
 
 [avogadro forum]: https://discuss.avogadro.cc
 [github tracker]: https://github.com/OpenChemistry/avogadrolibs/issues