diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 8be61474bc..2f1f17830a 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -1429,11 +1429,14 @@ function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
 	 * Filter the admin post thumbnail HTML markup to return.
 	 *
 	 * @since 2.9.0
+	 * @since 3.5.0 Added $post->ID
+	 * @since 4.6.0 Added $thumbnail_id
 	 *
-	 * @param string $content Admin post thumbnail HTML markup.
-	 * @param int    $post_id Post ID.
+	 * @param string $content      Admin post thumbnail HTML markup.
+	 * @param int    $post_id      Post ID.
+	 * @param int    $thumbnail_id Thumbnail ID.
 	 */
-	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID );
+	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index fff2d8196c..b7dc740ed9 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37195';
+$wp_version = '4.6-alpha-37196';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.