diff --git a/multi-post-thumbnails.php b/multi-post-thumbnails.php
index 817d49d..7d77394 100644
--- a/multi-post-thumbnails.php
+++ b/multi-post-thumbnails.php
@@ -450,6 +450,7 @@ public function set_thumbnail() {
 
 			if ($thumbnail_id == '-1') {
 				delete_post_meta($post_ID, $this->get_meta_key());
+				do_action( "delete_multi_thumbnail_{$this->id}", $post_ID );
 				die($this->post_thumbnail_html(null));
 			}
 
@@ -457,6 +458,7 @@ public function set_thumbnail() {
 				$thumbnail_html = wp_get_attachment_image($thumbnail_id, 'thumbnail');
 				if (!empty($thumbnail_html)) {
 					$this->set_meta($post_ID, $this->post_type, $this->id, $thumbnail_id);
+					do_action( "set_multi_thumbnail_{$this->id}", $post_ID, $thumbnail_id );
 					die($this->post_thumbnail_html($thumbnail_id));
 				}
 			}