diff --git a/core/modules/image/src/Tests/ImageThemeFunctionTest.php b/core/modules/image/src/Tests/ImageThemeFunctionTest.php
index 111f5ce..d8c2312 100644
--- a/core/modules/image/src/Tests/ImageThemeFunctionTest.php
+++ b/core/modules/image/src/Tests/ImageThemeFunctionTest.php
@@ -153,9 +153,10 @@ function testImageStyleTheme() {
   }
 
   /**
-   * Tests that alt in image's attributes is shown correctly.
+   * Tests image alt attribute functionality.
    */
   function testImageAltFunctionality() {
+    // Test using alt directly with alt attribute.
     $image_with_alt_working = array(
       '#theme' => 'image',
       '#uri' => '/core/themes/bartik/logo.png',
@@ -170,6 +171,7 @@ function testImageAltFunctionality() {
     $elements = $this->xpath('//img[contains(@class, class) and contains(@alt, :alt)]', array(":class" => "image-with-regular-alt", ":alt" => "Regular alt"));
     $this->assertEqual(count($elements), 1, 'Regular alt displays correctly');
 
+    // Test using alt attribute inside attributes.
     $image_with_alt_attribute_not_working = array(
       '#theme' => 'image',
       '#uri' => '/core/themes/bartik/logo.png',