diff --git a/src/ServiceLocator/Generator.php b/src/ServiceLocator/Generator.php
index 5e088987..72021810 100644
--- a/src/ServiceLocator/Generator.php
+++ b/src/ServiceLocator/Generator.php
@@ -31,6 +31,9 @@ class Generator
     /** @var DependencyInjectorProxy */
     protected $injector;
 
+    /**
+     * @var null|string
+     */
     protected $namespace;
 
     /**