diff --git a/core/lib/Drupal/Core/Entity/EntityChangedInterface.php b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
index 747571799c..9337cb0d68 100644
--- a/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
@@ -37,6 +37,10 @@ public function setChangedTime($timestamp);
   /**
    * Gets the timestamp of the last entity change across all translations.
    *
+   * This method will return the highest timestamp across all translations. If
+   * you need to check that no translation was changed after a certain time, you
+   * have to check each translation's timestamp individually.
+   *
    * @return int
    *   The timestamp of the last entity save operation across all
    *   translations.
diff --git a/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityChangedConstraintValidator.php b/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityChangedConstraintValidator.php
index 6906999596..271e24def2 100644
--- a/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityChangedConstraintValidator.php
+++ b/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityChangedConstraintValidator.php
@@ -30,6 +30,7 @@ public function validate($entity, Constraint $constraint) {
         // updates the entity object on submit. We use the timestamp to
         // determine when a previous entity translation version has been edited
         // and is currently being saved.
+        // @see \Drupal\node\NodeForm::form().
         if ($saved_entity) {
           $common_translation_languages = array_intersect_key($entity->getTranslationLanguages(), $saved_entity->getTranslationLanguages());
           foreach (array_keys($common_translation_languages) as $langcode) {