Merge pull request #941 from Wyfi0/patch-1

Update README.md

Author: schollz

README.md

@@ -68,14 +68,24 @@ choco install croc
 winget install schollz.croc
 ```
 
-### On Unix
+### Using nix-env
 
 You can install the latest release with [Nix](https://nixos.org/):
 
 ```bash
 nix-env -i croc
 ```
 
+### On NixOS
+
+You can add this to your [configuration.nix](https://nixos.org/manual/nixos/stable/#ch-configuration):
+
+```nix
+environment.systemPackages = [
+  pkgs.croc
+];
+```
+
 ### On Alpine Linux
 
 First, install dependencies: