diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php
index 09a03f2..00cac2c 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php
@@ -26,10 +26,10 @@ public function getRevisionLog();
   /**
    * Sets the block description.
    *
-   * @param string info
+   * @param string $info
    *   The block description.
    *
-   * @return \Drupal\custom_block\CustomBlock
+   * @return \Drupal\custom_block\CustomBlockInterface
    *   The class instance that this method is called on.
    */
   public function setInfo($info);
@@ -40,7 +40,7 @@ public function setInfo($info);
    * @param string $log
    *   The revision log message.
    *
-   * @return \Drupal\custom_block\CustomBlock
+   * @return \Drupal\custom_block\CustomBlockInterface
    *   The class instance that this method is called on.
    */
   public function setRevisionLog($log);
@@ -55,7 +55,7 @@ public function setRevisionLog($log);
    * @param string $theme
    *   The theme name.
    *
-   * @return \Drupal\custom_block\CustomBlock
+   * @return \Drupal\custom_block\CustomBlockInterface
    *   The class instance that this method is called on.
    */
   public function setTheme($theme);