diff --git a/plugins/techdocs-backend/examples/documented-component/docs/deeper-nav/even-deeper/index.md b/plugins/techdocs-backend/examples/documented-component/docs/deeper-nav/even-deeper/index.md
new file mode 100644
index 0000000000..33f63ea079
--- /dev/null
+++ b/plugins/techdocs-backend/examples/documented-component/docs/deeper-nav/even-deeper/index.md
@@ -0,0 +1,9 @@
+# Deeper Nav
+
+Useful to test ExpandableNavigationAddon!
+
+## I'm in too deep!
+
+## And I'm trying to keep
+
+### ...up above my head
diff --git a/plugins/techdocs-backend/examples/documented-component/docs/deeper-nav/index.md b/plugins/techdocs-backend/examples/documented-component/docs/deeper-nav/index.md
new file mode 100644
index 0000000000..3f3800a1d5
--- /dev/null
+++ b/plugins/techdocs-backend/examples/documented-component/docs/deeper-nav/index.md
@@ -0,0 +1,11 @@
+# Deeper Nav
+
+Useful to test ExpandableNavigationAddon!
+
+## Some nav for TOC
+
+Yes!
+
+### Some deeper TOC nav
+
+## What? A second element with long text!?
diff --git a/plugins/techdocs-backend/examples/documented-component/mkdocs.yml b/plugins/techdocs-backend/examples/documented-component/mkdocs.yml
index fd954225a3..4632c6eb13 100644
--- a/plugins/techdocs-backend/examples/documented-component/mkdocs.yml
+++ b/plugins/techdocs-backend/examples/documented-component/mkdocs.yml
@@ -8,6 +8,10 @@ nav:
   - 'Code Sample': code/code-sample.md
   - Extensions: extensions.md
   - 'Inner Component Docs': inner-component-docs/index.md
+  - 'Deeper Nav':
+      - deeper-nav/index.md
+      - 'Inner Deeper Nav':
+          - 'Inner Inner Deeper Nav': deeper-nav/even-deeper/index.md
 
 plugins:
   - techdocs-core