diff --git a/by-maintainer.nix b/by-maintainer.nix
new file mode 100644
index 0000000..e3f02d4
--- /dev/null
+++ b/by-maintainer.nix
@@ -0,0 +1,12 @@
+{ ... }@args:
+
+let
+	pkgs = (import <nixpkgs> {});
+in
+
+# convert package list to attrset
+with builtins; listToAttrs (
+	map ( x: { name = x.pname; value = x;} ) (
+		import "${pkgs.path}/maintainers/scripts/build.nix" args
+	)
+)
diff --git a/default.nix b/default.nix
index 1635f59..77fc08a 100644
--- a/default.nix
+++ b/default.nix
@@ -1,12 +1,5 @@
 { ... }@args:
 
-let
-	pkgs = (import <nixpkgs> {});
-in
-
-# 
-with builtins; listToAttrs (
-	map ( x: { name = x.pname; value = x;} ) (
-		import "${pkgs.path}/maintainers/scripts/build.nix" args
-	)
-)
+{
+	illustris = import ./by-maintainer.nix args;
+}