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Update README.md #3717

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Jan 8, 2018
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Update README.md #3717

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1 change: 1 addition & 0 deletions packages/react-scripts/template/README.md
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Expand Up @@ -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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