diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 92c84f0a5c..7ffdca13cf 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -155,7 +155,13 @@ class Configuration implements ConfigurationInterface
                         ->scalarNode('type')->end()
                         ->scalarNode('http_port')->defaultValue(80)->end()
                         ->scalarNode('https_port')->defaultValue(443)->end()
-                        ->scalarNode('strict_parameters')->defaultTrue()->end()
+                        ->scalarNode('strict_parameters')
+                            ->info(
+                                'set to false to disable exceptions when a route is '.
+                                'generated with invalid parameters (and return null instead)'
+                            )
+                            ->defaultTrue()
+                        ->end()
                     ->end()
                 ->end()
             ->end()