diff -u b/core/lib/Drupal/Core/Entity/EntityTypeInterface.php b/core/lib/Drupal/Core/Entity/EntityTypeInterface.php
--- b/core/lib/Drupal/Core/Entity/EntityTypeInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityTypeInterface.php
@@ -574,7 +574,7 @@
    * entities of this type in a select list.
    *
    * @return bool
-   *   TRUE if the entity data is internal. FALSE otherwise.
+   *   TRUE if the entity data is internal, FALSE otherwise.
    *
    * @see \Drupal\Core\TypedData\DataDefinitionInterface::isInternal()
    */