From 5e2c05151cf457c4b6bb9d684e429afb0f877f49 Mon Sep 17 00:00:00 2001
From: Mae Capozzi <maecapozzi@gmail.com>
Date: Mon, 8 Jan 2018 17:31:43 -0500
Subject: [PATCH] Update README.md (#3717)

* Update README.md with a note that reminds users to prepend REACT_APP_ to their environment variables.
* Based on #865, where Dan Abramov suggests the person who filed the issue create a PR with these changes.
* Took the language from [Adding Custom Environment Variables](https://github.com/facebookincubator/create-react-app/tree/master/packages/react-scripts/template#adding-custom-environment-variables)
---
 packages/react-scripts/template/README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/react-scripts/template/README.md b/packages/react-scripts/template/README.md
index 157073b74..287a0134e 100644
--- a/packages/react-scripts/template/README.md
+++ b/packages/react-scripts/template/README.md
@@ -944,6 +944,7 @@ To define permanent environment variables, create a file called `.env` in the ro
 ```
 REACT_APP_SECRET_CODE=abcdef
 ```
+>Note: You must create custom environment variables beginning with `REACT_APP_`. Any other variables except `NODE_ENV` will be ignored to avoid [accidentally exposing a private key on the machine that could have the same name](https://github.com/facebookincubator/create-react-app/issues/865#issuecomment-252199527). Changing any environment variables will require you to restart the development server if it is running.
 
 `.env` files **should be** checked into source control (with the exclusion of `.env*.local`).
 
-- 
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