minor changes to nix package documentation

README.md

@@ -125,23 +125,23 @@ brew install sniffnet
 
   <summary>from Nixpkgs</summary>
 
-  You can install [Sniffnet Nix package](https://search.nixos.org/packages?channel=23.05&show=sniffnet&from=0&size=50&sort=relevance&type=packages&query=sniffnet) in your system with:
+  You can install [Sniffnet Nix package](https://search.nixos.org/packages?channel=23.05&show=sniffnet&from=0&size=50&sort=relevance&type=packages&query=sniffnet) adding the following Nix code to your NixOS Configuration, usually located in `/etc/nixos/configuration.nix`:
 
   ```nix
   environment.systemPackages = [
     pkgs.sniffnet
   ];
 ```
 
-  You can install it in your home using [Home Manager](https://github.com/nix-community/home-manager) with:
+  Alternatively, you can install it in your home using [Home Manager](https://github.com/nix-community/home-manager) with:
 
   ```nix
   home.packages = [
     pkgs.sniffnet
   ];
 ```
 
-  You can install it in a shell with:
+  Alternatively, you can try it in a shell with:
   ```sh
 nix-shell -p sniffnet
 ```