diff --git a/docs/usage.rst b/docs/usage.rst
index c109a7a..988d45d 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -12,6 +12,8 @@ The `module`, `func` and `prog` options are required.
 
 `func` is a function that returns an instance of the `argparse.ArgumentParser` class.
 
+If `func` is a class method then use `klass` to indicate the class it belongs to.
+
 Alternatively, one can use :ref: like this::
 
     .. argparse::
diff --git a/sphinxarg/ext.py b/sphinxarg/ext.py
index acd4eb5..f939bb5 100644
--- a/sphinxarg/ext.py
+++ b/sphinxarg/ext.py
@@ -248,7 +248,7 @@ def ensureUniqueIDs(items):
 
 class ArgParseDirective(Directive):
     has_content = True
-    option_spec = dict(module=unchanged, func=unchanged, ref=unchanged,
+    option_spec = dict(module=unchanged, func=unchanged, klass=unchanged, ref=unchanged,
                        prog=unchanged, path=unchanged, nodefault=flag,
                        nodefaultconst=flag, filename=unchanged,
                        manpage=unchanged, nosubcommands=unchanged, passparser=flag,
@@ -419,6 +419,8 @@ def run(self):
         if 'module' in self.options and 'func' in self.options:
             module_name = self.options['module']
             attr_name = self.options['func']
+            if 'klass' in self.options:
+                klass_name = self.options['klass']
         elif 'ref' in self.options:
             _parts = self.options['ref'].split('.')
             module_name = '.'.join(_parts[0:-1])
@@ -445,6 +447,15 @@ def run(self):
             except:
                 raise self.error('Failed to import "%s" from "%s".\n%s' % (attr_name, module_name, sys.exc_info()[1]))
 
+            if 'klass' in self.options:
+                if not hasattr(mod, klass_name):
+                    raise self.error((
+                        'Module "%s" has no attribute "%s"\n'
+                        'Incorrect argparse :module: or :klass: values?'
+                    ) % (module_name, klass_name))
+
+                mod = getattr(mod, klass_name)
+
             if not hasattr(mod, attr_name):
                 raise self.error((
                     'Module "%s" has no attribute "%s"\n'