diff --git a/index.rst b/index.rst
index 3ea52fb..2e428a2 100644
--- a/index.rst
+++ b/index.rst
@@ -17,6 +17,7 @@ TODO
    engine/cpp_usage_guidelines
    engine/code_style
    engine/compatibility_breakages
+   engine/unit_tests
 
 .. toctree::
    :hidden: