diff --git a/installer/default.nix b/installer/default.nix
index a26331558369..bf6f6ee81b92 100644
--- a/installer/default.nix
+++ b/installer/default.nix
@@ -8,7 +8,7 @@ let
   });
 
 
-  nixosCheckout = (import ./nixosCheckout.nix){ 
+  nixosCheckout = (import ./nixos-checkout.nix) {
     inherit pkgs config makeProg;
   };
 
diff --git a/installer/nixosCheckout.nix b/installer/nixos-checkout.nix
similarity index 100%
rename from installer/nixosCheckout.nix
rename to installer/nixos-checkout.nix
diff --git a/installer/nixos-rebuild.sh b/installer/nixos-rebuild.sh
index 80ed41c7d95f..5bf6834c74cc 100644
--- a/installer/nixos-rebuild.sh
+++ b/installer/nixos-rebuild.sh
@@ -19,10 +19,11 @@ build:   build the configuration, but don't make it the default or
          activate it
 dry-run: just show what store paths would be built/downloaded
 
-by env overridable settings:
-NIXOS=${NIXOS}
-NIXPKGS=${NIXPKGS}
-NIXOS_CONFIG=${NIXOS_CONFIG}
+Environment variables affecting nixos-rebuild:
+
+  Path to NixOS:         NIXOS=${NIXOS}
+  Path to Nixpkgs:       NIXPKGS=${NIXPKGS}
+  Path to configuration: NIXOS_CONFIG=${NIXOS_CONFIG}
 "
 
 EOF