diff --git a/README.md b/README.md
index e075e04..1cf31b0 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,31 @@ This is the contents of the published config file:
 
 ```php
 return [
+    'enabled' => env('EMBEDDINGS_ENABLED', true),
+    'driver' => env('EMBEDDINGS_DRIVER', 'null'), // 'null' / 'openai'
+    'queue' => true,
+    'database' => [
+        'connection' => env('EMBEDDINGS_DATABASE_CONNECTION', 'pgsql'),
+        'table' => env('EMBEDDINGS_DB_TABLE', 'embeddings'),
+    ],
+    'openai' => [
+        'key' => env('OPENAI_API_KEY'),
+    ],
+
+    /*
+    |--------------------------------------------------------------------------
+    | Chunk Sizes
+    |--------------------------------------------------------------------------
+    |
+    | These options allow you to control the maximum chunk size when you are
+    | mass importing data into the embed engine. This allows you to fine
+    | tune each of these chunk sizes based on the power of the servers.
+    |
+    */
+    'chunk' => [
+        'embeddable' => 500,
+        'unembeddable' => 500,
+    ],
 ];
 ```
 
diff --git a/src/EngineManager.php b/src/EngineManager.php
index ea7b7ad..1d3b935 100644
--- a/src/EngineManager.php
+++ b/src/EngineManager.php
@@ -69,8 +69,9 @@ public function forgetEngines()
      */
     public function getDefaultDriver()
     {
-        if (is_null($driver = config('embeddings.driver'))) {
-            return 'openai';
+        $driver = config('embeddings.driver');
+        if (is_null($driver)) {
+            return 'null';
         }
 
         return $driver;