diff --git a/integrations/symfony-full-configuration.rst b/integrations/symfony-full-configuration.rst
index b98ba7f..406d6ce 100644
--- a/integrations/symfony-full-configuration.rst
+++ b/integrations/symfony-full-configuration.rst
@@ -41,6 +41,7 @@ This page shows an example of all configuration values provided by the bundle.
                 config:
                     default_ttl: 3600
                     respect_cache_headers: true
+                    cache_key_generator: null # This must be a service id to a service implementing 'Http\Client\Common\Plugin\Cache\Generator\CacheKeyGenerator'. If 'null' 'Http\Client\Common\Plugin\Cache\Generator\SimpleGenerator' will be used.
             cookie:
                 cookie_jar: my_cookie_jar
             decoder: