diff --git a/controllers/admin/AdminImagesController.php b/controllers/admin/AdminImagesController.php
index d0c9901ad7201..7fc6850881bc5 100644
--- a/controllers/admin/AdminImagesController.php
+++ b/controllers/admin/AdminImagesController.php
@@ -774,6 +774,7 @@ public function initContent()
 
         if ($this->display == 'edit') {
             $this->warnings[] = $this->trans('After modification, do not forget to regenerate thumbnails', [], 'Admin.Design.Notification');
+            $this->warnings[] = $this->trans('Make sure the theme you use doesn\'t rely on this image format before deleting it.', [], 'Admin.Design.Notification');
         }
 
         parent::initContent();