# Confused by "Install with existing Nix installation" documentation

**URL:** https://discourse.flox.dev/t/confused-by-install-with-existing-nix-installation-documentation/870
**Category:** Help
**Created:** [March 29, 2024, 6:41pm UTC](https://discourse.flox.dev/t/confused-by-install-with-existing-nix-installation-documentation/870 "2024-03-29T18:41:31Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Crafteo](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.flox.dev/crafteo/32/650_2.png) [@Crafteo](https://discourse.flox.dev/u/Crafteo)
#### Post date: [March 29, 2024, 6:41pm UTC](https://discourse.flox.dev/t/confused-by-install-with-existing-nix-installation-documentation/870/1 "2024-03-29T18:41:32Z")

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Hi there,

I’m trying out Flox on my NixOS system (managed via plain configuration.nix). I was confused by the [some Install doc section](https://flox.dev/docs/install-flox/#install-flox), stating:

> The Flox installer will perform some opinionated configuration of Nix, but Nix will still be usable. […] it’s worth noting that anyone wishing to revert to a “vanilla” Nix installation after installing Flox will need to re-install Nix.

At first I though Flox would somehow override my current Nix or NixOS installation, but I just ran

```auto
nix profile install --impure \
      --experimental-features "nix-command flakes" \
      --accept-flake-config \
      'github:flox/flox'

```

And it works fine without having impacted my system or Nix installation. Did I miss something?

Or maybe this section is not supposed to appear when installing Flox via the NixOS tab ? It seems this warning appears whatever the installation method chosen, so maybe it does not apply to NixOS-based installation ?

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### Author: ![mkenigs](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.flox.dev/mkenigs/32/520_2.png) [@mkenigs](https://discourse.flox.dev/u/mkenigs)
#### Post date: [March 29, 2024, 7:11pm UTC](https://discourse.flox.dev/t/confused-by-install-with-existing-nix-installation-documentation/870/2 "2024-03-29T19:11:06Z")

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Yeah currently that note is in a separate section, so changing the tab doesn’t hide it. But you’re right - for Nix/NixOS installation, it doesn’t perform any opinionated config. Maybe we need to move that warning inside the tab so it’s less confusing

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<div class="post-metadata">

### Author: ![Crafteo](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.flox.dev/crafteo/32/650_2.png) [@Crafteo](https://discourse.flox.dev/u/Crafteo)
#### Post date: [March 29, 2024, 7:52pm UTC](https://discourse.flox.dev/t/confused-by-install-with-existing-nix-installation-documentation/870/3 "2024-03-29T19:52:40Z")

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Thanks for clarifying !