diff --git a/doc/conf.py b/doc/conf.py
index c60e69b..649563a 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -35,7 +35,7 @@ needs_sphinx = '1.1'
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ["breathe", "sphinxcontrib.doxylink", "sphinx.ext.autosummary", "sphinxcontrib.programoutput"]
+extensions = ["breathe", "sphinxcontrib.doxylink", "sphinx.ext.autosummary", "sphinxcontrib.programoutput", "sphinx.ext.inheritance_diagram"]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -224,6 +224,8 @@ man_pages = [
     ('index', 'virtualsmartcardarchitecture', u'Virtual Smartcard Architecture Documentation',
      [u'Dominik Oepen, Frank Morgner'], 1)
 ]
+
 breathe_projects = {"npa": "npa/xml"}
 breathe_default_project = "npa"
+
 doxylink = { 'npa' : ('npa/npa.tag', '_static/doxygen-npa/'), }
diff --git a/virtualsmartcard/doc/generate_modules.py b/virtualsmartcard/doc/generate_modules.py
index 00245a9..4f5720a 100755
--- a/virtualsmartcard/doc/generate_modules.py
+++ b/virtualsmartcard/doc/generate_modules.py
@@ -75,7 +75,8 @@ def format_heading(level, text):
 
 def format_directive(module, package=None):
     """Create the automodule directive and add the options."""
-    directive = '.. automodule:: %s\n' % makename(package, module)
+    directive  = '.. inheritance-diagram:: %s\n' % makename(package, module)
+    directive += '.. automodule:: %s\n' % makename(package, module)
     for option in OPTIONS:
         directive += '    :%s:\n' % option
     return directive