diff --git a/core/themes/classy/css/components/image-widget.css b/core/themes/classy/css/components/image-widget.css
index 66d4ed7..8bae2ef 100644
--- a/core/themes/classy/css/components/image-widget.css
+++ b/core/themes/classy/css/components/image-widget.css
@@ -3,6 +3,8 @@
  * Image upload widget.
  *
  * This file is not being loaded by Classy.
+ * If attach_library() is a function, not a tag so it can't be executed directly
+ * from image-widget.html.twig file.
  *
  * @see https://www.drupal.org/node/2641380
  */