diff --git a/Makefile b/Makefile
index 3bedfac..3589000 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,7 @@
 .PHONY: update
 update:
 	home-manager switch --flake .#t470
+
+.PHONY: clean
+clean:
+	nix-collect-garbage --delete-older-than 30d