diff --git a/readme.md b/readme.md
index 0e330b2..d231c5e 100644
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,11 @@
 # Nix Setup Guide
+Config file for nix is saved at location `$ /etc/nixos/configuration.nix`.
+This file defines all behaviores for your system.
+Apply it with `nixos-rebuild switch`.
+
+If you want to create an ephemeral enviroment for a specfic project:
+create a `shell.nix` file, put in config and run `$ nix-shell`.
+
 
 ## Framework laptop
 
@@ -10,4 +17,4 @@ https://github.com/NixOS/nixos-hardware/tree/master/framework/13-inch/7040-amd
 
 Copy and paste my framework-config into file /etc/nixos/configuration.nix
 Then run:  
-```$ nixos-rebuild switch```
\ No newline at end of file
+`$ nixos-rebuild switch`
\ No newline at end of file