diff --git a/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php b/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
index 89257cd..e7da564 100644
--- a/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
+++ b/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
@@ -415,7 +415,7 @@ protected function isValidUri($string) {
   }
 
   /**
-   * Checks if the specified definition asset is a full library .
+   * Checks if the specified definition asset is a full library.
    *
    * @param string $definition
    *   The asset definition being checked.
diff --git a/core/modules/system/src/Tests/Asset/LibraryDiscoveryIntegrationTest.php b/core/modules/system/src/Tests/Asset/LibraryDiscoveryIntegrationTest.php
index 476c815..f2560fc 100644
--- a/core/modules/system/src/Tests/Asset/LibraryDiscoveryIntegrationTest.php
+++ b/core/modules/system/src/Tests/Asset/LibraryDiscoveryIntegrationTest.php
@@ -132,7 +132,7 @@ public function testLibrariesOverrideOtherAssetLibraryNames() {
    * Tests that base theme libraries-override still apply in sub themes.
    */
   public function testBaseThemeLibrariesOverrideInSubTheme() {
-    // Activate test theme that has subthemes
+    // Activate test theme that has subthemes.
     $this->activateTheme('test_subtheme');
 
     // Assert that libraries-override specified in the base theme still applies