diff --git a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php
index 29ade7b..36e263f 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php
@@ -210,7 +210,31 @@ class Field extends ConfigEntityBase implements FieldInterface {
   protected $storageDetails;
 
   /**
-   * {@inheritdoc}
+   * Constructs a Field object.
+   * In most cases, it's constructed via entity_create('field_entity', $values).
+   *
+   * @param array $values
+   *   An array of values to set, keyed by property name. For specific property
+   *   description, please refer respective property inside this class.
+   *   - id: required. It's used to replace the original 'field_name' property.
+   *     Only lowercase alphanumeric characters and underscores are allowed, and
+   *     only lowercase letters and underscore are allowed as the first character.
+   *   - type: required.
+   *   - module: optional.
+   *   - active: optional.
+   *   - settings: optional.
+   *   - cardinality: optional. Default to be 1.
+   *   - translatable: optional. Default to be FALSE.
+   *   - entity_types: optional.
+   *   - locked: optional. Default to be FALSE.
+   *   - storage: optional.
+   *   - indexes: optional.
+   *   - deleted: optional. Default to be FALSE.
+   *   - schema: optional.
+   *   - storageDetails: optional.
+   *
+   * See: @link entity_create @endlink.
+   * See: @link field Field API data structures @endlink.
    */
   public function __construct(array $values, $entity_type = 'field_entity') {
     // Check required properties.
diff --git a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php
index 2942fd4..8c7a422 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php
@@ -226,7 +226,31 @@ class FieldInstance extends ConfigEntityBase implements FieldInstanceInterface {
   protected $bundle_rename_allowed = FALSE;
 
   /**
-   * {@inheritdoc}
+   * Constructs a Field object.
+   * In most cases, it's constructed via entity_create('field_instance', $values).
+   *
+   * @param array $values
+   *   An array of values to set, keyed by property name. For specific property
+   *   description, please refer respective property inside this class.
+   *   - field_name: optional. This field instance is attached to this field.
+   *   - field_uuid: optional. Either this property or field_name is required
+   *     to build field instance. Property field_name will gain higher priority.
+   *     If field_name is not provided, field_uuid will be checked.
+   *   - entity_type: required.
+   *   - bundle: required.
+   *   - label: optional.
+   *   - description: optional.
+   *   - settings: optional.
+   *   - required: optional. Default to be FALSE.
+   *   - default_value: optional.
+   *   - default_value_function: optional.
+   *   - widget: optional.
+   *   - deleted: optional. Default to be FALSE.
+   *   - field: optional.
+   *   - widgetPlugin: optional.
+   *   - bundle_rename_allowed : optional.
+   *
+   * See: @link entity_create @endlink.
    */
   public function __construct(array $values, $entity_type = 'field_instance') {
     // Accept incoming 'field_name' instead of 'field_uuid', for easier DX on