diff --git a/docs/environment.md b/docs/environment.md
index 457bb73..64b6e94 100644
--- a/docs/environment.md
+++ b/docs/environment.md
@@ -151,6 +151,17 @@
 
 'toast_position' => env('SWEET_ALERT_TOAST_POSITION', 'top-end'),
 
+/*
+|--------------------------------------------------------------------------
+| Progress Bar
+|--------------------------------------------------------------------------
+| If set to true, a progress bar at the bottom of a popup will be shown.
+| It can be useful with toasts.
+|
+*/
+
+'timer_progress_bar' => env('SWEET_ALERT_TIMER_PROGRESS_BAR', false),
+
 /*
 |--------------------------------------------------------------------------
 | Middleware