diff --git a/Image.class.php b/Image.class.php
index 2206929..3ac4d6d 100644
--- a/Image.class.php
+++ b/Image.class.php
@@ -8,6 +8,10 @@ abstract class Image extends File
     public $size;
 
     public $original_filename;
+
+    /**
+     * @var ImageVariant[]
+     */
     public $variants = array();
 
     protected static $max_width;