diff --git a/src/zona/markdown.py b/src/zona/markdown.py
index b829be6..024b48a 100644
--- a/src/zona/markdown.py
+++ b/src/zona/markdown.py
@@ -13,6 +13,7 @@ from markdown.extensions.md_in_html import MarkdownInHtmlExtension
 from markdown.extensions.sane_lists import SaneListExtension
 from markdown.extensions.smarty import SmartyExtension
 from markdown.extensions.tables import TableExtension
+from markdown.extensions.toc import TocExtension
 from markdown.treeprocessors import Treeprocessor
 from pygments.formatters.html import HtmlFormatter
 from pymdownx.betterem import BetterEmExtension
@@ -146,6 +147,7 @@ def md_to_html(
         FootnoteExtension(),
         AttrListExtension(),
         DefListExtension(),
+        TocExtension(),
         TableExtension(),
         AbbrExtension(),
         SmartyExtension(),