private function addSeoSection(ArrayNodeDefinition $node)
    {
        /** @noinspection PhpUndefinedMethodInspection */
        $node
            ->children()
                ->arrayNode('seo')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->booleanNode('no_follow')->defaultFalse()->end()
                        ->booleanNode('no_index')->defaultFalse()->end()
                        ->scalarNode('title_append')->defaultValue('')->end()
                    ->end()
                ->end()
            ->end();
    }