diff --git a/core/modules/system/src/Plugin/views/field/BulkForm.php b/core/modules/system/src/Plugin/views/field/BulkForm.php
index 07bf3eb..1e25ef9 100644
--- a/core/modules/system/src/Plugin/views/field/BulkForm.php
+++ b/core/modules/system/src/Plugin/views/field/BulkForm.php
@@ -364,7 +364,13 @@ protected function drupalSetMessage($message = NULL, $type = 'status', $repeat =
   /**
    * Calculates a bulk form key.
    *
+   * This generates a key that is used as the checkbox return value when
+   * submitting a bulk form. This key allow the entity for the row to be loaded
+   * totally independently of the executed view row.
+   *
    * @return string
+   *
+   * @see loadEntityFromBulkFormKey
    */
   protected function calculateEntityBulkFormKey(EntityInterface $entity) {
     $key_parts = [$entity->language()->getId(), $entity->id()];