diff --git a/NodeGraphQt/base/factory.py b/NodeGraphQt/base/factory.py
index 7de47484..6da3f9db 100644
--- a/NodeGraphQt/base/factory.py
+++ b/NodeGraphQt/base/factory.py
@@ -14,14 +14,32 @@ class NodeFactory(object):
 
     @property
     def names(self):
+        """
+        Return all currently registered node type identifiers.
+
+        Returns:
+            dict: key=<node name, value=node_type
+        """
         return self.__names
 
     @property
     def aliases(self):
+        """
+        Return aliases assigned to the node types.
+
+        Returns:
+            dict: key=alias, value=node type
+        """
         return self.__aliases
 
     @property
     def nodes(self):
+        """
+        Return all registered nodes.
+
+        Returns:
+            dict: key=node identifier, value=node class
+        """
         return self.__nodes
 
     def create_node_instance(self, node_type=None, alias=None):
diff --git a/NodeGraphQt/base/model.py b/NodeGraphQt/base/model.py
index ce248d30..38cb1c0d 100644
--- a/NodeGraphQt/base/model.py
+++ b/NodeGraphQt/base/model.py
@@ -282,7 +282,19 @@ def set_node_common_properties(self, attrs):
                         }
                     }
         """
-        self.__common_node_props.update(attrs)
+        for node_type in attrs.keys():
+            node_props = attrs[node_type]
+
+            if node_type not in self.__common_node_props.keys():
+                self.__common_node_props[node_type] = node_props
+                continue
+
+            for prop_name, prop_attrs in node_props.items():
+                common_props = self.__common_node_props[node_type]
+                if prop_name not in common_props.keys():
+                    common_props[prop_name] = prop_attrs
+                    continue
+                common_props[prop_name].update(prop_attrs)
 
     def get_node_common_properties(self, node_type):
         """
diff --git a/NodeGraphQt/base/node.py b/NodeGraphQt/base/node.py
index 74a33eac..56739acc 100644
--- a/NodeGraphQt/base/node.py
+++ b/NodeGraphQt/base/node.py
@@ -234,8 +234,8 @@ def create_property(self, name, value, items=None, range=None,
             value (object): data.
             items (list[str]): items used by widget type NODE_PROP_QCOMBO
             range (tuple)): min, max values used by NODE_PROP_SLIDER
-            widget_type (int): widget type flag (not implemented yet).
-            tab (str): name of the widget tab to display in.
+            widget_type (int): widget flag to display in the properties bin.
+            tab (str): name of the widget tab to display in the properties bin.
         """
         self.model.add_property(name, value, items, range, widget_type, tab)
 
diff --git a/README.md b/README.md
index 22a2ffd5..39c3890b 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 ---
 
 NodeGraphQt is a node graph framework that can be implemented and re purposed into 
-applications that supports PySide and PySide2.
+applications that supports PySide2.
 
 <img src="/docs/_images/screenshot.png" width="100%" title="NodeGraphQt">
 
@@ -30,7 +30,8 @@ http://chantasticvfx.com/nodeGraphQt/html/index.html
 
 ```python
 import sys
-from PySide2 import QtWidgets
+
+from NodeGraphQt import QtWidgets
 from NodeGraphQt import NodeGraph, Node, Backdrop, setup_context_menu
 
 # create a example node object with a input/output port.
diff --git a/docs/overview.rst b/docs/overview.rst
index 7f88d22c..f7ee3b54 100644
--- a/docs/overview.rst
+++ b/docs/overview.rst
@@ -61,8 +61,8 @@ example code:
     :linenos:
 
     import sys
-    from PySide2 import QtWidgets
 
+    from NodeGraphQt import QtWidgets
     from NodeGraphQt import NodeGraph, BaseNode, setup_context_menu