diff --git a/Makefile b/Makefile
index 1fcd38d..8a7b0dd 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,12 @@ clean-log:
 full-auto: submodules-update upgrade clean optimise
 	@date
 
+list-installed-packages:
+	@# source : https://functor.tokyo/blog/2018-02-20-show-packages-installed-on-nixos
+	@# https://www.domenkozar.com/2014/01/02/getting-started-with-nix-package-manager/
+	@#nixos-option environment.systemPackages
+	nixos-option environment.systemPackages | head -2 | tail -1 | sed -e 's/ /\n/g' | cut -d- -f2- | sort | uniq| sed -e 's/"$$//'
+
 optimise:
 	$(TIME) nix optimise-store