diff --git a/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php
index ace8fd715b..8f2d932195 100644
--- a/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php
@@ -61,7 +61,7 @@ public function on404(ExceptionEvent $event) {
   /**
    * Log 4xx errors.
    *
-   * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+   * @param \Symfony\Component\HttpKernel\Event\ExceptionEvent $event
    *   The event to process.
    */
   public function on4xx(ExceptionEvent $event) {
diff --git a/core/modules/dblog/tests/src/Functional/DbLogTest.php b/core/modules/dblog/tests/src/Functional/DbLogTest.php
index e0d212a846..0211fe6f0c 100644
--- a/core/modules/dblog/tests/src/Functional/DbLogTest.php
+++ b/core/modules/dblog/tests/src/Functional/DbLogTest.php
@@ -902,19 +902,20 @@ public function testBacktrace() {
   }
 
   /**
-   * Tests that 4xx exceptions are reported in logs correctly.
+   * Tests that a 4xx errors are logged as a '4xx error'.
    */
   public function test4xxExceptionHandling() {
     // Create a node.
     $this->drupalCreateContentType(['type' => 'article']);
     $node = $this->drupalCreateNode(['type' => 'article', 'title' => 'Test article']);
 
-    // 4xx exceptions that are not handled should not be logged as php errors.
+    // Create a uri that will cause a 406 error.
     $uri = $node->toUrl('canonical', [
       'query' => ['_format' => 'hal_json'],
     ]);
 
     $this->drupalGet($uri);
+    // Confirm that a php error was not logged and that a 4xx error was.
     $php = Database::getConnection()->query("SELECT * FROM {watchdog} WHERE type='php'")->fetchAll();
     $fxx = Database::getConnection()->query("SELECT * FROM {watchdog} WHERE type='4xx error'")->fetchAll();
     $this->assertCount(0, $php);