diff --git a/markup/templating/templating.md b/markup/templating/templating.md
index efc44195..08e2ae61 100644
--- a/markup/templating/templating.md
+++ b/markup/templating/templating.md
@@ -118,3 +118,7 @@ Tag | Equivalent
 ------------- | -------------
 `{% extend %}` | Use [Layouts](../../docs/cms/layouts) or `{% placeholder %}`
 `{% include %}` | Use `{% partial %}` or `{% content %}`
+
+## Custom Twig filters and functions
+
+Custom Twig filters and functions can be registered with the `registerMarkupTags` method of the plugin registration class. For detailed documentation see [Extending Twig](../../docs/plugin/registration#extending-twig).