diff --git a/doc/source/api/diffpy.labpdfproc.data.rst b/doc/source/api/diffpy.labpdfproc.data.rst
new file mode 100644
index 0000000..7ff7501
--- /dev/null
+++ b/doc/source/api/diffpy.labpdfproc.data.rst
@@ -0,0 +1,9 @@
+:tocdepth: -1
+
+diffpy.labpdfproc.data package
+==============================
+
+.. automodule:: diffpy.labpdfproc.data
+    :members:
+    :undoc-members:
+    :show-inheritance:
diff --git a/doc/source/api/diffpy.labpdfproc.example_package.rst b/doc/source/api/diffpy.labpdfproc.example_package.rst
deleted file mode 100644
index 429ad23..0000000
--- a/doc/source/api/diffpy.labpdfproc.example_package.rst
+++ /dev/null
@@ -1,31 +0,0 @@
-.. _example_package documentation:
-
-|title|
-=======
-
-.. |title| replace:: diffpy.labpdfproc.example_package package
-
-.. automodule:: diffpy.labpdfproc.example_package
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
-|foo|
------
-
-.. |foo| replace:: diffpy.labpdfproc.example_package.foo module
-
-.. automodule::  diffpy.labpdfproc.example_package.foo
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
-|bar|
------
-
-.. |bar| replace:: diffpy.labpdfproc.example_package.bar module
-
-.. automodule:: diffpy.labpdfproc.example_package.foo
-    :members:
-    :undoc-members:
-    :show-inheritance:
diff --git a/doc/source/api/diffpy.labpdfproc.rst b/doc/source/api/diffpy.labpdfproc.rst
index 4f0a72d..941776e 100644
--- a/doc/source/api/diffpy.labpdfproc.rst
+++ b/doc/source/api/diffpy.labpdfproc.rst
@@ -8,6 +8,14 @@ diffpy.labpdfproc package
     :undoc-members:
     :show-inheritance:
 
+Subpackages
+-----------
+
+.. toctree::
+    :titlesonly:
+
+    diffpy.labpdfproc.data
+
 Submodules
 ----------
 
@@ -27,6 +35,14 @@ diffpy.labpdfproc.tools module
     :undoc-members:
     :show-inheritance:
 
+diffpy.labpdfproc.mud_calculator module
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. automodule:: diffpy.labpdfproc.mud_calculator
+    :members:
+    :undoc-members:
+    :show-inheritance:
+
 diffpy.labpdfproc.labpdfprocapp module
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 688e25c..8c9095e 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -18,8 +18,6 @@
 from importlib.metadata import version
 from pathlib import Path
 
-autodoc_mock_imports = ["diffpy.utils", "numpy"]
-
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use Path().resolve() to make it absolute, like shown here.
diff --git a/doc/source/installation.rst b/doc/source/installation.rst
deleted file mode 100644
index 9b35fb5..0000000
--- a/doc/source/installation.rst
+++ /dev/null
@@ -1,7 +0,0 @@
-============
-Installation
-============
-
-At the command line::
-
-    $ pip install diffpy.labpdfproc
diff --git a/doc/source/min_versions.rst b/doc/source/min_versions.rst
deleted file mode 100644
index d28e747..0000000
--- a/doc/source/min_versions.rst
+++ /dev/null
@@ -1,28 +0,0 @@
-===================================
-Minimum Version of Python and NumPy
-===================================
-
-
-- This project supports at least the minor versions of Python
-  initially released 42 months prior to a planned project release
-  date.
-- The project will always support at least the 2 latest minor
-  versions of Python.
-- The project will support minor versions of ``numpy`` initially
-  released in the 24 months prior to a planned project release date or
-  the oldest version that supports the minimum Python version
-  (whichever is higher).
-- The project will always support at least the 3 latest minor
-  versions of NumPy.
-
-The minimum supported version of Python will be set to
-``python_requires`` in ``setup``.  All supported minor versions of
-Python will be in the test matrix and have binary artifacts built
-for releases.
-
-The project should adjust upward the minimum Python and NumPy
-version support on every minor and major release, but never on a
-patch release.
-
-This is consistent with NumPy `NEP 29
-<https://numpy.org/neps/nep-0029-deprecation_policy.html>`__.
diff --git a/doc/source/release-history.rst b/doc/source/release-history.rst
deleted file mode 100644
index 53707fb..0000000
--- a/doc/source/release-history.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-===============
-Release History
-===============
-
-Initial Release (YYYY-MM-DD)
-----------------------------
diff --git a/doc/source/usage.rst b/doc/source/usage.rst
deleted file mode 100644
index 4c19f3d..0000000
--- a/doc/source/usage.rst
+++ /dev/null
@@ -1,9 +0,0 @@
-=====
-Usage
-=====
-
-Start by importing diffpy.labpdfproc.
-
-.. code-block:: python
-
-    import labpdfproc
diff --git a/news/api_doc.rst b/news/api_doc.rst
new file mode 100644
index 0000000..5c301ef
--- /dev/null
+++ b/news/api_doc.rst
@@ -0,0 +1,23 @@
+**Added:**
+
+* generate package API doc
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>