doc: readme updates to talk about Nix

README.md

@@ -82,23 +82,20 @@ Host utility binaries are provided for Windows.
 *The following steps are not necessary if cloning a binary release. If so, skip to*
 *"Installing Limine binaries".*
 
-### Prerequisites
-
 ### Building with Nix
 
 This repository provides [Nix](https://nixos.org/)-based tooling for a convenient 
 development environment and building Limine using Nix.
 
-To use the regular build flow using a toolchain obtained by Nix, simply
-run `$ nix develop` to open a Nix shell. To build Limine completely in Nix 
-using the latest sources, you can run:
-
 - `$ nix build .#\limine` (build with clang and `--enable-all`)
 
-Limine is not yet in `nixpkgs`.
+To use the regular build flow using a toolchain obtained by Nix, simply
+run `$ nix develop` to open a Nix shell. Then follow the guide below.
 
 ### Regular build
 
+#### Prerequisites
+
 In order to build Limine, the following programs have to be installed:
 common UNIX tools (also known as `coreutils`),
 `GNU make`, `grep`, `sed`, `find`, `awk`, `gzip`, `nasm`, `mtools`
@@ -147,6 +144,19 @@ make install    # (or gmake where applicable)
 
 ## How to use
 
+### Consume via Nix
+
+Limine is not yet in `nixpkgs`.
+
+You can consume this as Nix flake:
+
+```nix
+{
+  inputs.limine.url = "github:limine-bootloader/limine/<branch>";
+  inputs.limine.inputs.nixpkgs.follows = "nixpkgs";
+}
+```
+
 ### UEFI
 The `BOOT*.EFI` files are valid EFI applications that can be simply copied to
 the `/EFI/BOOT` directory of a FAT formatted EFI system partition. These files can