diff --git a/core/modules/system/core.api.php b/core/modules/system/core.api.php
index 3907c6d..5e08004 100644
--- a/core/modules/system/core.api.php
+++ b/core/modules/system/core.api.php
@@ -9,8 +9,8 @@
  * @mainpage
  * Welcome to the Drupal API Documentation!
  *
- * This site is the official API reference for Drupal, generated from comments
- * embedded in the source code. More in-depth documentation can be found at
+ * This site is an API reference for Drupal, generated from comments embedded
+ * in the source code. More in-depth documentation can be found at
  * https://drupal.org/developing/api.
  *
  * Here are some topics to help you get started developing with Drupal.