diff --git a/machines/runtime-environment.html.md b/machines/runtime-environment.html.md
index 41503407a2..2f7a78d194 100644
--- a/machines/runtime-environment.html.md
+++ b/machines/runtime-environment.html.md
@@ -48,5 +48,5 @@ Useful if your app needs to launch Machine instances of itself to scale backgrou
 **Machine memory**: The memory allocated to the Machine, in MB. It's the same value you'll find under https://fly.io/dashboard/personal/machines and VM Memory in the output of `fly machine status`. Learn more about [Machine sizing](/docs/machines/guides-examples/machine-sizing/).
 
 ### `PRIMARY_REGION`
-**Primary region**: This is set in your `fly.toml` or with the `--region` flag during deploys. Learn more about [configuring the primary region](/docs/reference/configuration/#primary-region).
- 
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+**Primary region**: This is set in your `fly.toml` or with the `--region` flag when using `fly launch`. Learn more about [configuring the primary region](/docs/reference/configuration/#primary-region).
+