diff -u b/core/lib/Drupal/Core/Entity/EntityReferenceSelection/SelectionInterface.php b/core/lib/Drupal/Core/Entity/EntityReferenceSelection/SelectionInterface.php
--- b/core/lib/Drupal/Core/Entity/EntityReferenceSelection/SelectionInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityReferenceSelection/SelectionInterface.php
@@ -17,12 +17,12 @@
   /**
    * Gets the list of referenceable entities.
    *
-   * @param $match
-   *    String that needs to be matched.
+   * @param string $match
+   *   (optional) String that needs to be matched.
    * @param $match_operator
-   *    Match operator that needs to be applied on String.
+   *   (optional) Match operator that needs to be applied on String.
    * @param $limit
-   *    Limit which is set to 0 as default.
+   *   (optional) Limit which is set to 0 as default.
    *
    * @return array
    *   A nested array of entities, the first level is keyed by the
@@ -35,9 +35,9 @@
    * Counts entities that are referenceable.
    *
    * @param $match
-   *    String that needs to be matched.
+   *   (optional) String that needs to be matched.
    * @param $match_operator
-   *    Match operator that needs to be applied on String.
+   *   (optional) Match operator that needs to be applied on String.
    *
    * @return int
    *   The number of referenceable entities.
@@ -48,7 +48,7 @@
    * Validates which existing entities can be referenced.
    *
    * @param $ids
-   *   An array of id's passed to validate.
+   *   An array of Ids to validate.
    *
    * @return array
    *   An array of valid entity IDs.