diff --git a/zensical.toml b/zensical.toml
index edaf07b..198231d 100644
--- a/zensical.toml
+++ b/zensical.toml
@@ -266,7 +266,7 @@ features = [
     # When navigation integration for the table of contents is enabled, it is
     # always rendered as part of the navigation sidebar on the left.
     # https://zensical.org/docs/setup/navigation/#navigation-integration
-    #"toc.integrate",
+    "toc.integrate"
 ]
 
 # ----------------------------------------------------------------------------
@@ -397,3 +397,72 @@ note = """
   <a href="https://github.com/DnA-IntRicate/AdamFoflonker/issues/new/?title=[Feedback]+{title}+-+{url}" target="_blank" rel="noopener">
   GitHub issue</a>.
 """
+
+# Markdown extensions
+#
+# See: https://zensical.org/docs/setup/extensions/#configuration
+[project.markdown_extensions.abbr]
+#
+[project.markdown_extensions.admonition]
+#
+[project.markdown_extensions.attr_list]
+#
+[project.markdown_extensions.def_list]
+#
+[project.markdown_extensions.footnotes]
+#
+[project.markdown_extensions.md_in_html]
+#
+[project.markdown_extensions.tables]
+#
+[project.markdown_extensions.toc]
+permalink = true
+toc_depth = 3
+#
+[project.markdown_extensions.toc.slugify]
+object = "pymdownx.slugs.slugify"
+kwds = { case = "lower" }
+#
+[project.markdown_extensions.pymdownx.arithmatex]
+generic = true
+#
+[project.markdown_extensions.pymdownx.betterem]
+smart_enable = "all"
+#
+[project.markdown_extensions.pymdownx.blocks.caption]
+#
+[project.markdown_extensions.pymdownx.caret]
+#
+[project.markdown_extensions.pymdownx.details]
+#
+[project.markdown_extensions.pymdownx.emoji]
+emoji_generator = "zensical.extensions.emoji.to_svg"
+emoji_index = "zensical.extensions.emoji.twemoji"
+#
+[project.markdown_extensions.pymdownx.highlight]
+anchor_linenums = true
+#
+[project.markdown_extensions.pymdownx.inlinehilite]
+#
+[project.markdown_extensions.pymdownx.keys]
+#
+[project.markdown_extensions.pymdownx.mark]
+#
+[project.markdown_extensions.pymdownx.smartsymbols]
+#
+[project.markdown_extensions.pymdownx.superfences]
+custom_fences = [
+  { name = "mermaid", class = "mermaid", format = "pymdownx.superfences.fence_code_format" }
+]
+#
+[project.markdown_extensions.pymdownx.tabbed]
+alternate_style = true
+#
+[project.markdown_extensions.pymdownx.tabbed.slugify]
+object = "pymdownx.slugs.slugify"
+kwds = { case = "lower" }
+#
+[project.markdown_extensions.pymdownx.tasklist]
+custom_checkbox = true
+#
+[project.markdown_extensions.pymdownx.tilde]