diff --git a/core/modules/block/lib/Drupal/block/BlockInterface.php b/core/modules/block/lib/Drupal/block/BlockInterface.php
index 7946716..b8189f7 100644
--- a/core/modules/block/lib/Drupal/block/BlockInterface.php
+++ b/core/modules/block/lib/Drupal/block/BlockInterface.php
@@ -1,6 +1,7 @@
 <?php
 
 /**
+ * @file
  * Contains \Drupal\block\BlockInterface.
  */
 
@@ -33,6 +34,67 @@
   public function blockSettings();
 
   /**
+   * Indicates whether the block should be shown.
+   *
+   * This method allows base implementations to add general access restrictions
+   * that should apply to all extending block plugins.
+   *
+   * @return bool
+   *   TRUE if the block should be shown, or FALSE otherwise.
+   *
+   * @see \Drupal\block\BlockAccessController
+   */
+  public function blockAccess();
+
+  /**
+   * Constructs the block configuration form.
+   *
+   * This method allows base implementations to add a generic configuration
+   * form for extending block plugins.
+   *
+   * @param array $form
+   *   The form definition array for the block configuration form.
+   * @param array $form_state
+   *   An array containing the current state of the configuration form.
+   *
+   * @return array $form
+   *   The renderable form array representing the entire configuration form.
+   *
+   * @see \Drupal\block\BlockFormController::form()
+   * @see \Drupal\block\BlockInterface::blockValidate()
+   * @see \Drupal\block\BlockInterface::blockSubmit()
+   */
+  public function blockForm($form, &$form_state);
+
+  /**
+   * Handles form validation for the block configuration form.
+   *
+   * @param array $form
+   *   The form definition array for the block configuration form.
+   * @param array $form_state
+   *   An array containing the current state of the configuration form.
+   *
+   * @see \Drupal\block\BlockFormController::validate()
+   * @see \Drupal\block\BlockInterface::blockForm()
+   * @see \Drupal\block\BlockInterface::blockSubmit()
+   */
+  public function blockValidate($form, &$form_state);
+
+  /**
+   * Handles form submissions for the block configuration form.
+   *
+   * @param array $form
+   *   The form definition array for the block configuration form.
+   * @param array $form_state
+   *   An array containing the current state of the configuration form.
+   *
+   * @see \Drupal\block\BlockFormController::submit()
+   * @see \Drupal\block\BlockInterface::blockForm()
+   * @see \Drupal\block\BlockInterface::blockValidate()
+   */
+  public function blockSubmit($form, &$form_state);
+
+  /**
    * Builds and returns the renderable array for this block plugin.
    *
    * @param \Drupal\block\Plugin\Core\Entity\Block $entity
@@ -40,6 +102,8 @@ public function blockSettings();
    *
    * @return array
    *   A renderable array representing the content of the block.
+   *
+   * @see \Drupal\block\BlockRenderController
    */
   public function blockBuild(Block $entity);