diff --git a/docs/developer/events/customer.md b/docs/developer/events/customer.md
index 5d56f76..326ed38 100644
--- a/docs/developer/events/customer.md
+++ b/docs/developer/events/customer.md
@@ -22,7 +22,7 @@ use BillaBear\Entity\Customer;
 
 class CustomerCreated
 {
-    public const NAME = 'billabear.customer.created';
+    public const string NAME = 'billabear.customer.created';
 
     public function __construct(public readonly Customer $customer)
     {
@@ -47,7 +47,7 @@ use BillaBear\Entity\Customer;
 
 class CustomerDisabled
 {
-    public const NAME = 'billabear.customer.disabled';
+    public const string NAME = 'billabear.customer.disabled';
 
     public function __construct(public readonly Customer $customer)
     {
@@ -72,7 +72,7 @@ use BillaBear\Entity\Customer;
 
 class CustomerEnabled
 {
-    public const NAME = 'billabear.customer.enabled';
+    public const string NAME = 'billabear.customer.enabled';
 
     public function __construct(public readonly Customer $customer)
     {