diff --git a/2.x/spark-stripe/configuration.md b/2.x/spark-stripe/configuration.md
index 390b095..1846244 100644
--- a/2.x/spark-stripe/configuration.md
+++ b/2.x/spark-stripe/configuration.md
@@ -222,7 +222,7 @@ After defining the environment variable, enable the top up feature using its cor
 ```php
 'features' => [
     ...
-    Features::topups(['price' => env('SPARK_TOP_UP_PRICESPARK_TOP_UP_PRICESPARK_TOP_UP_PRICE')]),
+    Features::topups(['price' => env('SPARK_TOP_UP_PRICE')]),
     ...
 ],
 ```