diff --git a/core/modules/system/src/Tests/Theme/FunctionsTest.php b/core/modules/system/src/Tests/Theme/FunctionsTest.php
index 878a64c..028eb5a 100644
--- a/core/modules/system/src/Tests/Theme/FunctionsTest.php
+++ b/core/modules/system/src/Tests/Theme/FunctionsTest.php
@@ -290,7 +290,7 @@ function testLinks() {
   }
 
   /**
-   * Tests links.html.twig.
+   * Tests links.html.twig using links with indexed keys.
    */
   function testIndexedKeyedLinks() {
     // Turn off the query for the
diff --git a/core/themes/stable/stable.theme b/core/themes/stable/stable.theme
index 96fc1fe..456a4ad 100644
--- a/core/themes/stable/stable.theme
+++ b/core/themes/stable/stable.theme
@@ -1,5 +1,10 @@
 <?php
 
+/**
+ * @file
+ * Functions to support theming in the Stable theme.
+ */
+
 use Drupal\Component\Utility\Html;
 
 /**