Updated README.

Author: n1k0

README.md

@@ -179,6 +179,36 @@ The following props are passed to the widget component:
 - `placeholder`: The placeholder value, if any;
 - `options`: The list of options for `enum` fields;
 
+## Custom SchemaField
+
+**Warning:** This is a powerful feature as you can override the whole form behavior and easily mess it up. Handle with care.
+
+You can provide your own implementation of the `SchemaField` base React component for rendering any JSONSchema field type, including objects and arrays. This is useful when you want to augment a given field type with supplementary powers.
+
+To proceed so, you can pass a `SchemaField` prop to the `Form` component instance; here's a rather silly example wrapping the standard `SchemaField` lib component:
+
+```js
+import SchemaField from "react-jsonschema-form/lib/components/fields/SchemaField";
+
+const CustomSchemaField = function(props) {
+  return (
+    <div id="custom">
+      <p>Yeah, I'm pretty dumb.</p>
+      <SchemaField {...props} />
+    </div>
+  );
+};
+
+render((
+  <Form schema={schema}
+        uiSchema={uiSchema}
+        formData={formData}
+        SchemaField={CustomSchemaField} />
+), document.getElementById("app"));
+```
+
+If you're curious how this could ever be useful, have a look at the [Kinto formbuilder](https://github.com/Kinto/formbuilder) repository to see how it's used to provide editing capabilities to any form field.
+
 ## Development server
 
 ```