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Clarify enabling experimental Nix features in README #274

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Clarify enabling experimental Nix features in README #274

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11 changes: 11 additions & 0 deletions README.md
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Expand Up @@ -182,3 +182,14 @@ typelevelShell = {
[direnv]: https://direnv.net/
[Laika]: https://planet42.github.io/Laika/
[bundix]: https://github.com/nix-community/bundix

### I get a `'error: experimental Nix feature 'nix-command' is disabled; add '--extra-experimental-features nix-command' to enable it'`

Because typelevel-nix uses the [Nix command], which is an experimental feature. You can enable it by adding `--extra-experimental-features nix-command` to your `nix develop` command.

@rossabaker rossabaker Jun 25, 2026

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Is it --extra-experimental-features or --experimental-features? And include flakes or no? This sentence is inconsistent with the example below.


```shell
nix --experimental-features 'nix-command flakes' develop github:typelevel/typelevel-nix#library
```

But if you don't want to type all that, there are different places on your system you can [set it and forget it](https://wiki.nixos.org/wiki/Flakes#Setup).

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