diff --git a/core/lib/Drupal/Core/Entity/Query/QueryInterface.php b/core/lib/Drupal/Core/Entity/Query/QueryInterface.php
index 17b266f..4c12997 100644
--- a/core/lib/Drupal/Core/Entity/Query/QueryInterface.php
+++ b/core/lib/Drupal/Core/Entity/Query/QueryInterface.php
@@ -18,6 +18,7 @@
    * Gets the ID of the entity type for this query.
    *
    * @return string
+   *   The entity type ID.
    */
   public function getEntityTypeId();
 
@@ -134,17 +135,30 @@ public function notExists($field, $langcode = NULL);
   public function pager($limit = 10, $element = NULL);
 
   /**
-   * @param null $start
-   * @param null $length
+   * Defines the range of the query.
+   *
+   * @param int|null $start
+   *   (optional) The first record from the result set to return. If NULL,
+   *   removes any range directives that are set.
+   * @param int|null $length
+   *   (optional) The maximum number of rows to return. If $start and $length
+   *   are NULL, then a complete result set will be generated. If $start is
+   *   not NULL and $length is NULL, then an empty result set will be
+   *   generated.
+   *
    * @return \Drupal\Core\Entity\Query\QueryInterface
    *   The called object.
    */
   public function range($start = NULL, $length = NULL);
 
   /**
+   * Sorts the result set by a given field.
+   *
    * @param $field
    *   Name of a field.
    * @param string $direction
+   *   The direction to sort. Legal values are "ASC" and "DESC".
+   *   Any other value will be converted to "ASC".
    * @param $langcode
    *   Language code (optional).
    * @return \Drupal\Core\Entity\Query\QueryInterface
@@ -177,6 +191,11 @@ public function count();
   public function tableSort(&$headers);
 
   /**
+   * Enables or disables access checking for this query.
+   *
+   * @param bool $access_check
+   *   (optional) Whether access check is requested or not. Defaults to TRUE.
+   *
    * @return \Drupal\Core\Entity\Query\QueryInterface
    *   The called object.
    */
@@ -212,6 +231,7 @@ public function execute();
    * @endcode
    *
    * @return \Drupal\Core\Entity\Query\ConditionInterface
+   *   A condition object whose conditions will be combined with AND.
    */
   public function andConditionGroup();
 
@@ -240,6 +260,7 @@ public function andConditionGroup();
    * @endcode
    *
    * @return \Drupal\Core\Entity\Query\ConditionInterface
+   *   A condition object whose conditions will be combined with OR.
    */
   public function orConditionGroup();