DOC Update README

README.md

@@ -4,7 +4,7 @@ A stand-alone `GridField` component that enables previewing records directly fro
 
 ## Install
 
-```
+```sh
 composer require guysartorelli/silverstripe-gridfield-preview
 ```
 
@@ -18,7 +18,7 @@ Click the preview button in the gridfield. This will automatically open the prev
 
 ## Developer Usage
 
-So far this has only been tested in a `ModelAdmin` which manages a `CMSPreviewable` model. This is not guaranteed to work in a `GridField` sitting inside the edit form of another `CMSPreviewable` record - though if you do try that, let me know how it goes.
+### Directly inn a `ModelAdmin`
 
 The easiest way to use this module is to add `PreviewableModelAdminExtension` as an extension for your `ModelAdmin` subclass. By default this will add a preview button to the gridfield for all tabs that have `CMSPreviewable` models.
 
@@ -37,3 +37,27 @@ MyApp\Admin\MyModelAdmin:
   gridfield_previewable_classes:
     - MyApp\Model\MyPreviewableModel
 ```
+
+### In literally any other `GridField`
+
+You can add the `GridFieldPreviewButton` `GridField` component to literally _any_ `GridField`, even one that belongs to a `DataObject` which has its own preview!
+
+```php
+use GuySartorelli\GridFieldPreview\GridFieldPreviewButton;
+use SilverStripe\Forms\GridField\GridField;
+use SilverStripe\Forms\GridField\GridFieldConfig_RecordViewer;
+
+//...
+
+    public function getCMSFields()
+    {
+        $fields = parent::getCMSFields();
+
+        $fields->addFieldToTab('Root.Main', GridField::create('SomethingPreviewable', 'Something Previewable', BaseElement::get(), $config = GridFieldConfig_RecordViewer::create()));
+
+        // Here's the important part - add the GridFieldPreviewButton component!
+        $config->addComponent(GridFieldPreviewButton::create());
+
+        return $fields;
+    }
+```