diff --git a/core/lib/Drupal/Core/Entity/Query/Sql/Tables.php b/core/lib/Drupal/Core/Entity/Query/Sql/Tables.php
index 9d8f4f8..ba0c8ea 100644
--- a/core/lib/Drupal/Core/Entity/Query/Sql/Tables.php
+++ b/core/lib/Drupal/Core/Entity/Query/Sql/Tables.php
@@ -234,9 +234,25 @@ public function isFieldCaseSensitive($field_name) {
   /**
    * Join entity table if necessary and return the alias for it.
    *
+   * @param string $index_prefix
+   *   Prefix that will be put on this table in queries, when it is used within
+   *   this relationship.
    * @param string $property
+   *   Mapped field table name.
+   * @param string $type
+   *   Join type, can either be INNER or LEFT.
+   * @param string $langcode
+   *   Language code.
+   * @param string $base_table
+   *   Base table name.
+   * @param string $id_field
+   *   Field name.
+   * @param array $entity_tables
+   *   A two dimensional array, the first is the name of a base or data table,
+   *   the second is a column name.
    *
    * @return string
+   *   The table alias.
    *
    * @throws \Drupal\Core\Entity\Query\QueryException
    */
@@ -255,9 +271,25 @@ protected function ensureEntityTable($index_prefix, $property, $type, $langcode,
   /**
    * Join field table if necessary.
    *
-   * @param $field_name
-   *   Name of the field.
+   * @param string $index_prefix
+   *   Prefix that will be put on this table in queries, when it is used within
+   *   this relationship.
+   * @param object $field
+   *   A field object.
+   * @param string $type
+   *   Join type, can either be INNER or LEFT.
+   * @param string $langcode
+   *   Language code.
+   * @param string $base_table
+   *   Base table name.
+   * @param string $entity_id_field
+   *   Either entity field ID value, or revision field ID value.
+   * @param array $field_id_field
+   *   Whether it is entity ID, or revision ID.
+   *
    * @return string
+   *   The table alias.
+   *
    * @throws \Drupal\Core\Entity\Query\QueryException
    */
   protected function ensureFieldTable($index_prefix, &$field, $type, $langcode, $base_table, $entity_id_field, $field_id_field) {
@@ -295,6 +327,8 @@ protected function addJoin($type, $table, $join_condition, $langcode) {
    *
    * @param string $table
    *   The table name.
+   * @param int $entity_type_id
+   *   The entity type ID.
    *
    * @return array|bool
    *   The table field mapping for the given table or FALSE if not available.