diff --git a/README-extensions.rst b/README-extensions.rst
index e67e441..da9ce85 100644
--- a/README-extensions.rst
+++ b/README-extensions.rst
@@ -33,7 +33,7 @@
 .. code-block:: yaml
 
   ignore_class_notfound: False
-  ignore_class_regexp: ['.*']
+  ignore_class_notfound_regexp: ['.*']
 
 If you set regexp pattern to ``service.*`` all missing classes starting 'service.' will be logged with warning, but will not
 fail to return rendered reclass. Assuming all parameter interpolation passes.