diff --git a/eZ/Publish/API/Repository/Values/Content/Thumbnail.php b/eZ/Publish/API/Repository/Values/Content/Thumbnail.php
index 7bd33b8807..994c4c572e 100644
--- a/eZ/Publish/API/Repository/Values/Content/Thumbnail.php
+++ b/eZ/Publish/API/Repository/Values/Content/Thumbnail.php
@@ -10,6 +10,12 @@
 
 use eZ\Publish\API\Repository\Values\ValueObject;
 
+/**
+ * @property-read string $resource
+ * @property-read int|null $width
+ * @property-read int|null $height
+ * @property-read string|null $mimeType
+ */
 class Thumbnail extends ValueObject
 {
     /**