diff --git a/core/lib/Drupal/Core/File/file.api.php b/core/lib/Drupal/Core/File/file.api.php
index 43913fb..29c1a33 100644
--- a/core/lib/Drupal/Core/File/file.api.php
+++ b/core/lib/Drupal/Core/File/file.api.php
@@ -18,9 +18,9 @@
  * Drupal and returning the file from a public directory. Modules can also
  * provide headers to specify information like the file's name or MIME type.
  *
- * @param $uri
+ * @param string $uri
  *   The URI of the file.
- * @return
+ * @return int|array|bool
  *   If the user does not have permission to access the file, return -1. If the
  *   user has permission, return an array with the appropriate headers. If the
  *   file is not controlled by the current module, the return value should be