diff --git a/Makefile b/Makefile
index be82796..dca2380 100644
--- a/Makefile
+++ b/Makefile
@@ -65,8 +65,6 @@ envtest:
 install-test: compile
 	pip3 install .[test]
 
-# TODO: maybe use setup.py test?
-# --forked, because every test needs a separate process, see PYADPT-100
 test:
 	pytest
 
@@ -88,6 +86,7 @@ clean-all: clean
 	rm -rf $(VENV_DIR)
 
 clean: clean-docs
+	$(MAKE) -C src/pEp/_gen clean-all
 	rm -rf $(BUILD_DIR)
 	rm -rf $(DIST_DIR)
 	rm -rf $(PYTHON_ARTIFACTS)
diff --git a/docs/source/api/pEp._gen.rst b/docs/source/api/pEp._gen.rst
new file mode 100644
index 0000000..8d03167
--- /dev/null
+++ b/docs/source/api/pEp._gen.rst
@@ -0,0 +1,8 @@
+Module pEp._gen
+---------------
+.. automodule:: pEp._gen
+   :members:
+   :imported-members:
+   :undoc-members:
+   :show-inheritance:
+
diff --git a/docs/source/api/pEp._pEp.rst b/docs/source/api/pEp._pEp.rst
new file mode 100644
index 0000000..2639a86
--- /dev/null
+++ b/docs/source/api/pEp._pEp.rst
@@ -0,0 +1,7 @@
+Module pEp._pEp
+---------------
+.. automodule:: pEp._pEp
+   :members:
+   :imported-members:
+   :undoc-members:
+   :show-inheritance:
diff --git a/docs/source/api/pEp.rst b/docs/source/api/pEp.rst
index 586e991..f0af6f4 100644
--- a/docs/source/api/pEp.rst
+++ b/docs/source/api/pEp.rst
@@ -1,12 +1,7 @@
-pEp package
-===========
-
-Module contents
----------------
-
+Module pEp
+----------
 .. automodule:: pEp
    :members:
    :imported-members:
    :undoc-members:
    :show-inheritance:
-
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 3a966f5..e4ded02 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -92,7 +92,7 @@ html_theme = "nature"
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ["_static"]
+#html_static_path = ["_static"]
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 8c59365..14789c1 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -13,6 +13,9 @@ Welcome to pEpPythonAdapter's documentation!
    install
    software_using
    api/pEp
+   api/pEp._pEp
+   api/pEp._gen
+
 Indices and tables
 ==================