diff --git a/src/bundle/DependencyInjection/Configuration.php b/src/bundle/DependencyInjection/Configuration.php
index 45d6c567..3226975a 100644
--- a/src/bundle/DependencyInjection/Configuration.php
+++ b/src/bundle/DependencyInjection/Configuration.php
@@ -168,8 +168,16 @@ private function addCustomStylesSection(NodeBuilder $ezRichTextNode)
      * ezpublish:
      *     ezrichtext:
      *         alloy_editor:
+     *             extra_plugins: [plugin1, plugin2]
+     *             extra_buttons:
+     *                 paragraph: [button1, button2]
+     *                 embed: [button1]
      * </code>
      *
+     * Please note extra_buttons setting will be deprecated in eZ Platform 3.x.
+     * The alternative and more flexible solution will be introduced.
+     * So you will need to update Online Editor Extra Buttons as part of eZ Platform 3.x upgrade.
+     *
      * @param \Symfony\Component\Config\Definition\Builder\NodeBuilder $ezRichTextNode
      *
      * @return \Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition
@@ -183,6 +191,12 @@ private function addAlloyEditorSection(NodeBuilder $ezRichTextNode)
                             ->example(['plugin1', 'plugin2'])
                             ->prototype('scalar')->end()
                         ->end()
+                        ->arrayNode('extra_buttons')
+                            ->arrayPrototype()
+                                ->example(['button1', 'button2'])
+                                ->prototype('scalar')->end()
+                            ->end()
+                        ->end()
                     ->end()
                 ->end()
             ;