diff --git a/Makefile b/Makefile
index 4e38bc3..1b9ad60 100644
--- a/Makefile
+++ b/Makefile
@@ -10,6 +10,9 @@ clean-aggressive:
 clean-log:
 	journalctl --vacuum-size=1G
 
+optimise:
+	nix-store --optimise
+
 rebuild-switch:
 	nixos-rebuild switch