diff --git a/core/lib/Drupal/Core/Entity/EntityInterface.php b/core/lib/Drupal/Core/Entity/EntityInterface.php
index 9cdb435..76ca630 100644
--- a/core/lib/Drupal/Core/Entity/EntityInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityInterface.php
@@ -230,6 +230,9 @@ public function hasLinkTemplate($key);
   /**
    * Gets a list of URI relationships supported by this entity.
    *
+   * The entity must have an ID already. Content entities usually get their IDs
+   * by saving them.
+   *
    * @return string[]
    *   An array of link relationships supported by this entity.
    */
diff --git a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
index 216f900..a5fc2c5 100644
--- a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
+++ b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
@@ -183,7 +183,7 @@ public static function getSkippedDeprecations() {
       'The Symfony\Component\ClassLoader\ApcClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use `composer install --apcu-autoloader` instead.',
       'The Symfony\Component\ClassLoader\WinCacheClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use `composer install --apcu-autoloader` instead.',
       'The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.',
-      'The Symfony\Component\HttpFoundation\Session\Storage\Handler\WriteCheckSessionHandler class is deprecated since Symfony 3.4 and will be removed in 4.0. Implement `SessionUpdateTimestampHandlerInterface` or extend `AbstractSessionHandler` instead.',
+      'Implement `SessionUpdateTimestampHandlerInterface` or extend `AbstractSessionHandler` instead.',
       'The "session_handler.write_check" service relies on the deprecated "Symfony\Component\HttpFoundation\Session\Storage\Handler\WriteCheckSessionHandler" class. It should either be deprecated or its implementation upgraded.',
       'Not setting the strict option of the Choice constraint to true is deprecated since Symfony 3.4 and will throw an exception in 4.0.',
       'Using the Yaml::PARSE_KEYS_AS_STRINGS flag is deprecated since Symfony 3.4 as it will be removed in 4.0. Quote your keys when they are evaluable instead.',