diff --git a/src/Lib/Extension/README.md b/src/Lib/Extension/README.md
index 0a0f3342..a2e74a47 100644
--- a/src/Lib/Extension/README.md
+++ b/src/Lib/Extension/README.md
@@ -26,6 +26,16 @@ EventManager::instance()
     });
 ```
 
+The `SwaggerBake.beforeRender` is dispatched once, just before SwaggerBake converts 
+data to an OpenAPI array or json.
+
+```php
+EventManager::instance()
+    ->on('SwaggerBake.beforeRender', function (Event $event) {
+        // your code
+    });
+```
+
 ## Adding your Extension to the SwaggerBake project
 
 1. Your extension must implement ExtensionInterface. Read the interfaces comments and refer to the CakeSearch 
diff --git a/src/Lib/Swagger.php b/src/Lib/Swagger.php
index 35a444f5..781f5fce 100644
--- a/src/Lib/Swagger.php
+++ b/src/Lib/Swagger.php
@@ -3,6 +3,8 @@
 
 namespace SwaggerBake\Lib;
 
+use Cake\Event\Event;
+use Cake\Event\EventManager;
 use Cake\Utility\Inflector;
 use SwaggerBake\Lib\Decorator\RouteDecorator;
 use SwaggerBake\Lib\Exception\SwaggerBakeRunTimeException;
@@ -72,6 +74,10 @@ public function __construct(EntityScanner $entityScanner)
      */
     public function getArray(): array
     {
+        EventManager::instance()->dispatch(
+            new Event('SwaggerBake.beforeRender', $this->array)
+        );
+
         foreach ($this->array['paths'] as $method => $paths) {
             foreach ($paths as $pathId => $path) {
                 if ($path instanceof Path) {