diff --git a/EXTEND.md b/EXTEND.md
index 5a3689d2..76727cef 100644
--- a/EXTEND.md
+++ b/EXTEND.md
@@ -57,11 +57,11 @@ add_action( 'data_liberated_product', function( $subject ) {
     $date    = $subject->date;
     $content = $subject->content;
     
-    // access entire html source of page
+    // access the entire HTML source of page
     // $subject->source_html
     
-    // access transformation output
-    // $subject->transformed_post();
+    // access native transformation output
+    // $subject->get_transformed_post();
     
     // Create a product in your custom post type
     $my_product_id = wp_insert_post( array(
@@ -72,13 +72,11 @@ add_action( 'data_liberated_product', function( $subject ) {
         'post_status'  => 'publish',
     ) );
     
-    // Store a reference to the source
-    update_post_meta( $my_product_id, \DotOrg\TryWordPress\Transformer::META_KEY_LIBERATED_SOURCE, $subject->id() );
+    // Store reference, with a unique slug representing your plugin
+    $subject->store_reference( $my_product_id, 'mycompany_myplugin_unique_slug' );
     
-    // Store a reference to your transformation in the source
-    $unique_plugin_slug = 'mycompany_myplugin_my_product_type'; // make sure this is unique for your plugin
-    $meta_key = \DotOrg\TryWordPress\Transformer::META_KEY_LIBERATED_OUTPUT . '_' . $unique_plugin_slug; // definitely use this prefix
-    update_post_meta( $subject->id(), $meta_key, $my_product_id );
+    // access your plugin's transformation output
+    // $subject->get_transformed_post( 'mycompany_myplugin_unique_slug' );
 } );
 ```
 
@@ -100,10 +98,9 @@ add_filter( 'data_liberation_preview_transformed_post_id', function( $default_po
     }
     
     // Find your transformed product
-    $unique_plugin_slug = 'mycompany_myplugin_my_product_type'; // make sure this is unique for your plugin
-    $meta_key = \DotOrg\TryWordPress\Transformer::META_KEY_LIBERATED_OUTPUT . '_' . $unique_plugin_slug; // definitely use this prefix
-    $product_id = get_post_meta( $subject->id(), $meta_key, true );
-    return $product_id ? $product_id : $default_post_id;
+    $post = $subject->get_transformed_post( 'mycompany_myplugin_unique_slug' );
+    
+    return $post ? $post->ID : $default_post_id;
 }, 10, 2 );
 ```
 
@@ -118,11 +115,11 @@ foreach( \DotOrg\TryWordPress\Subject_Repo::loop( 'product' ) as $subject ) {
     $date    = $subject->date;
     $content = $subject->content;
     
-    // access entire html source of page
+    // access the entire HTML source of page
     // $subject->source_html
     
-    // access transformation output
-    // $subject->transformed_post();
+    // access native transformation output
+    // $subject->get_transformed_post();
     
     // Create a product in your custom post type
     $my_product_id = wp_insert_post( array(
@@ -133,13 +130,11 @@ foreach( \DotOrg\TryWordPress\Subject_Repo::loop( 'product' ) as $subject ) {
         'post_status'  => 'publish',
     ) );
     
-    // Store a reference to the source
-    update_post_meta( $my_product_id, \DotOrg\TryWordPress\Transformer::META_KEY_LIBERATED_SOURCE, $subject->id() );
+    // Store reference, with a unique slug representing your plugin
+    $subject->store_reference( $my_product_id, 'mycompany_myplugin_unique_slug' );
     
-    // Store a reference to your transformation in the source
-    $unique_plugin_slug = 'mycompany_myplugin_my_product_type'; // make sure this is unique for your plugin
-    $meta_key = \DotOrg\TryWordPress\Transformer::META_KEY_LIBERATED_OUTPUT . '_' . $unique_plugin_slug; // definitely use this prefix
-    update_post_meta( $subject->id(), $meta_key, $my_product_id );
+    // access your plugin's transformation output
+    // $subject->get_transformed_post( 'mycompany_myplugin_unique_slug' );
 }
 ```
 
diff --git a/src/plugin/class-subject.php b/src/plugin/class-subject.php
index c14eb707..a120fcba 100644
--- a/src/plugin/class-subject.php
+++ b/src/plugin/class-subject.php
@@ -13,7 +13,6 @@
 class Subject {
 
 	private int $id;
-	private int $transformed_post_id;
 
 	public string $source_html;
 	public string $type;
@@ -50,15 +49,28 @@ private function __construct( WP_Post $post ) {
 		$this->title   = get_post_meta( $post->ID, 'raw_title', true );
 		$this->date    = get_post_meta( $post->ID, 'raw_date', true );
 		$this->content = get_post_meta( $post->ID, 'raw_content', true );
-
-		$this->transformed_post_id = absint( get_post_meta( $post->ID, Transformer::META_KEY_LIBERATED_OUTPUT, true ) );
 	}
 
 	public function id(): int {
 		return $this->id;
 	}
 
-	public function transformed_post(): WP_Post {
-		return WP_Post::get_instance( $this->transformed_post_id );
+	public function get_transformed_post( string $unique_plugin_slug ): WP_Post {
+		$meta_key = Transformer::META_KEY_LIBERATED_OUTPUT;
+		if ( ! empty( $unique_plugin_slug ) ) {
+			$meta_key .= '_' . $unique_plugin_slug;
+		}
+		$transformed_post_id = absint( get_post_meta( $this->id, $meta_key, true ) );
+
+		return WP_Post::get_instance( $transformed_post_id );
+	}
+
+	public function store_reference( int $transformed_post_id, string $unique_plugin_slug ): void {
+		// Store a reference to the source
+		update_post_meta( $transformed_post_id, Transformer::META_KEY_LIBERATED_SOURCE, $this->id );
+
+		// Store a reference to your transformation in the source
+		$meta_key = Transformer::META_KEY_LIBERATED_OUTPUT . '_' . $unique_plugin_slug;
+		update_post_meta( $this->id, $meta_key, $transformed_post_id );
 	}
 }