diff --git a/docs/guide/usage/mocking-dependency.rst b/docs/guide/usage/mocking-dependency.rst
index a416ac0..de37430 100644
--- a/docs/guide/usage/mocking-dependency.rst
+++ b/docs/guide/usage/mocking-dependency.rst
@@ -136,6 +136,12 @@ E.g.:
 
     class FakeConfigProvider implements ConfigProviderInterface
     {
+        /** @var bool */
+        private $isFreeDeliveryEnabled = false;
+
+        /** @var float */
+        private $freeDeliveryThreshold = 0.0;
+
         public function isFreeDeliverEnabled(): bool
         {
             return $this->isFreeDeliveryEnabled;