diff --git a/compose/gettingstarted.md b/compose/gettingstarted.md
index 271baaafe1..9d936790a8 100644
--- a/compose/gettingstarted.md
+++ b/compose/gettingstarted.md
@@ -236,7 +236,7 @@ services:
 The new `volumes` key mounts the project directory (current directory) on the
 host to `/code` inside the container, allowing you to modify the code on the
 fly, without having to rebuild the image. The `environment` key sets the
-`FLASK_ENV` environment variable, which tells `flask run` to run in development
+`FLASK_DEBUG` environment variable, which tells `flask run` to run in development
 mode and reload the code on change. This mode should only be used in development.
 
 ## Step 6: Re-build and run the app with Compose