diff --git a/core/lib/Drupal/Core/Cache/CacheBackendInterface.php b/core/lib/Drupal/Core/Cache/CacheBackendInterface.php
index c314391..a251116 100644
--- a/core/lib/Drupal/Core/Cache/CacheBackendInterface.php
+++ b/core/lib/Drupal/Core/Cache/CacheBackendInterface.php
@@ -125,7 +125,7 @@ public function set($cid, $data, $expire = CacheBackendInterface::CACHE_PERMANEN
    *       'data' => $data,
    *       // Optional, defaults to CacheBackendInterface::CACHE_PERMANENT.
    *       'expire' => CacheBackendInterface::CACHE_PERMANENT,
-   *       // @see CacheBackendInterface::set().
+   *       // (optional) The cache tags for this item, see CacheBackendInterface::set().
    *       'tags' => array(),
    *     ),
    *   );
diff --git a/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php b/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
index 5e76dbb..c692c54 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
@@ -297,8 +297,8 @@ public function testSetMultiple() {
     $backend->setMultiple($items);
     $cids = array_keys($items);
     $cached = $backend->getMultiple($cids);
-    $this->assertEqual($cached['cid_1']->data, $items['cid_1']['data'], t('Over-written cache item set correctly.'));
-    $this->assertEqual($cached['cid_2']->data, $items['cid_2']['data'], t('New cache item set correctly.'));
+    $this->assertEqual($cached['cid_1']->data, $items['cid_1']['data'], 'Over-written cache item set correctly.');
+    $this->assertEqual($cached['cid_2']->data, $items['cid_2']['data'], 'New cache item set correctly.');
   }
 
   /**