diff --git a/docs/customizations.rst b/docs/customizations.rst
index f3e259cd..fa29517b 100644
--- a/docs/customizations.rst
+++ b/docs/customizations.rst
@@ -10,7 +10,7 @@ By default, spec dict is validated on spec creation time. Disabling the validato
 
    from openapi_core import Spec
 
-   spec = Spec.create(spec_dict, validator=False)
+   spec = Spec.create(spec_dict, validator=None)
 
 Deserializers
 -------------