diff --git a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/AllowedValuesConstraintValidator.php b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/AllowedValuesConstraintValidator.php
index ae13c9d..5dbe64c 100644
--- a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/AllowedValuesConstraintValidator.php
+++ b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/AllowedValuesConstraintValidator.php
@@ -35,7 +35,8 @@ public function validate($value, Constraint $constraint) {
           throw new \LogicException('Cannot validate allowed values for complex data without a main property.');
         }
         $value = $typed_data->get($name)->getValue();
-        // If main property's value is NULL, we make the validation pass.
+        // If main property's value is empty, e.g., FALSE, NULL, 0, we make
+        // the validation pass.
         if (empty($value)) {
           return TRUE;
         }