diff --git a/flake.nix b/flake.nix
index 2b416434..f5efb4ad 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,6 +4,7 @@
   nixConfig = {
     experimental-features = [ "nix-command" "flakes" ];
     # Manual optimise storage: nix-store --optimise
+    # https://nixos.org/manual/nix/stable/command-ref/conf-file.html#conf-auto-optimise-store
     auto-optimise-store = true;
 
     substituters = [