Added comment

Author: Nyholm

DependencyInjection/Configuration.php

@@ -74,6 +74,7 @@ public function getConfigTreeBuilder()
                 ->arrayNode('toolbar')
                     ->canBeDisabled()
                     ->addDefaultsIfNotSet()
+                    ->info("Extend the debug profiler with inforation about requests. This could only be active when the kernel is in debug mode. ")
                     ->children()
                         ->scalarNode('formatter')->defaultNull()->end()
                     ->end()