diff --git a/test/TestAsset/SimplePluginManager.php b/test/TestAsset/SimplePluginManager.php
index 2e6fd6b9..0962f9ef 100644
--- a/test/TestAsset/SimplePluginManager.php
+++ b/test/TestAsset/SimplePluginManager.php
@@ -6,7 +6,11 @@
 
 use Laminas\ServiceManager\AbstractSingleInstancePluginManager;
 
+/**
+ * @template-extends AbstractSingleInstancePluginManager<InvokableObject>
+ */
 final class SimplePluginManager extends AbstractSingleInstancePluginManager
 {
+    /** @var class-string<InvokableObject> */
     protected string $instanceOf = InvokableObject::class;
 }