diff --git a/README.md b/README.md
index 5b43d6a..4055990 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 Simple tool for backlight brightness control. For build from source needs
 [Nim](https://nim-lang.org/) language compiler.
 
+In NixOS download file `nbackbright.nix` and run `nix-env -f nbackbright.nix -i`.
+
 Usage: `nbackbright <percent>`, where `<percent>` is a percentage of brightness
 changing.