diff --git a/core/includes/schema.inc b/core/includes/schema.inc
index 45ac9a2..3547dbf 100644
--- a/core/includes/schema.inc
+++ b/core/includes/schema.inc
@@ -1,9 +1,6 @@
 <?php
 
-/**
- * @file
- * Schema API handling functions.
- */
+use Drupal\Core\Database\Database;
 
 /**
  * @addtogroup schemaapi
@@ -155,6 +152,9 @@ function drupal_uninstall_schema($module) {
  * @param string $table
  *   The name of the table. If not given, the module's complete schema
  *   is returned.
+ *
+ * @return array
+ *   The module's schema or empty string if not found.
  */
 function drupal_get_module_schema($module, $table = NULL) {
   // Load the .install file to get hook_schema.