diff -u b/core/lib/Drupal/Core/Annotation/PluralTranslation.php b/core/lib/Drupal/Core/Annotation/PluralTranslation.php
--- b/core/lib/Drupal/Core/Annotation/PluralTranslation.php
+++ b/core/lib/Drupal/Core/Annotation/PluralTranslation.php
@@ -19,7 +19,8 @@
  * @code
  *   label_count = @ PluralTranslation(
  *     singular = "1 item",
- *     plural = "@count items"
+ *     plural = "@count items",
+ *     context = "cart_items",
  *   ),
  * @endcode
  * Remove spaces after @ in your actual plugin - these are put into this sample
@@ -44,11 +45,11 @@
 class PluralTranslation extends AnnotationBase {
 
   /**
-   * The string for the singular case.
+   * The context the source strings belong to.
    *
    * @var string
    */
-  protected $singular;
+  protected $context;
 
   /**
    * The string for the plural case.
@@ -58,11 +59,21 @@
   protected $plural;
 
   /**
-   * Constructs a PluralTranslation object.
+   * The string for the singular case.
+   *
+   * @var string
+   */
+  protected $singular;
+
+  /**
+   * Constructs a new class instance.
    */
   public function __construct($values) {
     $this->singular = $values['singular'];
     $this->plural = $values['plural'];
+    if (isset($values['context'])) {
+      $this->context = $values['context'];
+    }
   }
 
   /**
@@ -72,6 +83,7 @@
     return array(
       'singular' => $this->singular,
       'plural' => $this->plural,
+      'context' => $this->context,
     );
   }
 
only in patch2:
unchanged:
--- a/core/modules/system/lib/Drupal/system/Tests/Plugin/Discovery/CustomDirectoryAnnotatedClassDiscoveryTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Plugin/Discovery/CustomDirectoryAnnotatedClassDiscoveryTest.php
@@ -51,6 +51,11 @@ protected function setUp() {
         'color' => 'yellow',
         'uses' => array(
           'bread' => t('Banana bread'),
+          'loaf' => array(
+            'singular' => '1 loaf',
+            'plural' => '@count loafs',
+            'context' => NULL,
+          ),
         ),
         'class' => 'Drupal\plugin_test\Plugin\plugin_test\fruit\Banana',
         'provider' => 'plugin_test',
only in patch2:
unchanged:
--- /dev/null
+++ b/core/tests/Drupal/Tests/Core/Annotation/PluralTranslationTest.php
@@ -0,0 +1,66 @@
+<?php
+
+/**
+ * @file Contains \Drupal\Tests\Core\Annotation\PluralTranslationTest.
+ */
+
+namespace Drupal\Tests\Core\Annotation;
+
+use Drupal\Core\Annotation\PluralTranslation;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests \Drupal\Core\Annotation\PluralTranslation.
+ *
+ * @covers \Drupal\Core\Annotation\PluralTranslation.
+ */
+class PluralTranslationTest extends UnitTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getInfo() {
+    return array(
+      'description' => '',
+      'name' => '\Drupal\Core\Annotation\PluralTranslation unit test',
+      'group' => 'System',
+    );
+  }
+
+  /**
+   * @covers \Drupal\Core\Annotation\PluralTranslation::get()
++   *
++   * @dataProvider providerTestGet
+   */
+  public function testGet(array $values) {
+    $annotation = new PluralTranslation($values);
+
+    $default_values = array(
+      'context' => NULL,
+    );
+    $this->assertEquals($values + $default_values, $annotation->get());
+  }
+
+  /**
+   * Provides data to self::testGet().
+   */
+  public function providerTestGet() {
+    $data = array();
+    $data[] = array(
+      array(
+        'singular' => $this->randomName(),
+        'plural' => $this->randomName(),
+        'context' => $this->randomName(),
+      ),
+    );
+    $data[] = array(
+      array(
+        'singular' => $this->randomName(),
+        'plural' => $this->randomName(),
+      ),
+    );
+
+    return $data;
+  }
+
+}