diff --git a/core/lib/Drupal/Core/Extension/Extension.php b/core/lib/Drupal/Core/Extension/Extension.php
index e1e9b3d..17d8b09 100644
--- a/core/lib/Drupal/Core/Extension/Extension.php
+++ b/core/lib/Drupal/Core/Extension/Extension.php
@@ -167,7 +167,7 @@ public function __call($method, array $args) {
    */
   public function serialize() {
     // Don't serialize the app root, since this could change if the install is
-    // moved..
+    // moved.
     $data = array(
       'type' => $this->type,
       'pathname' => $this->pathname,
diff --git a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
index 78741d4..fc8d4c3 100644
--- a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
+++ b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
@@ -182,8 +182,8 @@ protected function setUp() {
     // Restore the original Simpletest batch.
     $this->restoreBatch();
 
-    // Set the container. parent::rebuildAll() would normally do this, but is
-    // not safe to do here because the database has not been updated yet.
+    // Set the container. parent::rebuildAll() would normally do this, but this
+    // not safe to do here, because the database has not been updated yet.
     $this->container = \Drupal::getContainer();
 
     // Replace User 1 with the user created here.