diff --git a/doc/source/index.rst b/doc/source/index.rst
index f012097..00c4e9a 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -33,6 +33,13 @@
    field_guide/thirdparty
    field_guide/whitebox
 
+------------------
+API and test cases
+------------------
+.. toctree::
+   :maxdepth: 1
+
+   api/modules
 
 ==================
 Indices and tables