diff -u b/exception_mailer.install b/exception_mailer.install
--- b/exception_mailer.install
+++ b/exception_mailer.install
@@ -9,7 +9,7 @@
 use Drupal\Core\StringTranslation\TranslatableMarkup;
 
 /**
- * Implements hook_update_N().
+ * Install the exception_mailer_exclude config entity type.
  */
 function exception_mailer_update_8301() {
   \Drupal::entityDefinitionUpdateManager()->installEntityType(new ConfigEntityType([
@@ -32,7 +32,7 @@
       'send_email',
       'emails',
       'roles',
-      'email_body'
+      'email_body',
     ],
   ]));
 }
only in patch2:
unchanged:
--- a/src/Entity/ExceptionMailerExclude.php
+++ b/src/Entity/ExceptionMailerExclude.php
@@ -33,6 +33,22 @@ use Drupal\exception_mailer\Utility\UserRepository;
  *     "id" = "id",
  *     "label" = "label"
  *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "description",
+ *     "type",
+ *     "exception",
+ *     "error_type",
+ *     "error_severity",
+ *     "message",
+ *     "hostname",
+ *     "send_email",
+ *     "emails",
+ *     "roles",
+ *     "email_body",
+ *     "send_interval"
+ *   },
  *   links = {
  *     "add-form" = "/admin/config/exception-mailer/excludes/add",
  *     "edit-form" = "/admin/config/exception-mailer/excludes/{exception_mailer_exclude}",