diff --git a/core/lib/Drupal/Core/Entity/ContentEntityBase.php b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
index 14f306f..c6ff65c 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
@@ -477,14 +477,7 @@ public function getFieldDefinitions() {
   }
 
   /**
-   * Returns an array of all property values.
-   *
-   * Gets an array of plain property or field values, including only
-   * non-computed values. Note that the structure varies by entity type and
-   * bundle.
-   *
-   * @return array
-   *   An array of property values, keyed by property name.
+   * {@inheritdoc}
    */
   public function toArray() {
     $values = array();
diff --git a/core/lib/Drupal/Core/Entity/ContentEntityInterface.php b/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
index dee43a0..78ee18c 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
@@ -124,4 +124,16 @@ public function getFieldDefinition($name);
    */
   public function getFieldDefinitions();
 
+  /**
+   * Returns an array of all field values.
+   *
+   * Gets an array of plain property or field values, including only
+   * non-computed values. Note that the structure varies by entity type and
+   * bundle.
+   *
+   * @return array
+   *   An array of field values, keyed by field name.
+   */
+  public function toArray();
+
 }