Update README.md

Author: dustinlyons

README.md

@@ -143,11 +143,14 @@ Thank you for the [installer](https://zero-to-nix.com/concepts/nix-installer), [
 ```sh
 curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
 ```
+
 After installation, open a new terminal session to make the `nix` executable available in your `$PATH`. You'll need this in the steps ahead.
 
 > [!IMPORTANT]
 >
-> If planning to upgrade to Sequoia, [prepare Nix](https://determinate.systems/posts/nix-support-for-macos-sequoia/) before proceeding.
+> The installer will ask if you want to install Determinate Nix. Answer _No_ as it [currently conflicts](https://github.com/dustinlyons/nixos-config/issues/146) with `nix-darwin`.
+
+> [!IMPORTANT]
 >
 > If using [the official installation instructions](https://nixos.org/download) instead, [`flakes`](https://nixos.wiki/wiki/Flakes) and [`nix-command`](https://nixos.wiki/wiki/Nix_command) aren't available by default.
 >
@@ -165,6 +168,10 @@ After installation, open a new terminal session to make the `nix` executable ava
 > nix --extra-experimental-features 'nix-command flakes' run .#<command>
 > ```
 
+> [!IMPORTANT]
+>
+> If you haven't upgraded to macOS Sequioa yet, read this article: [Nix Support for macOS Sequioa](https://determinate.systems/posts/nix-support-for-macos-sequoia/).
+
 ### 3. Initialize a starter template
 *Choose one of two options*