diff --git a/docs/docgen.nix b/docs/docgen.nix
index 227bd56..9838327 100644
--- a/docs/docgen.nix
+++ b/docs/docgen.nix
@@ -3,6 +3,11 @@
   mdbook,
   nixdoc,
   lib,
+  excluded ? [
+    ".*flake\\.nix$"
+
+    "^docs/.*"
+  ]
 }:
 stdenvNoCC.mkDerivation {
   name = "SkyOS-book";
@@ -13,12 +18,6 @@ stdenvNoCC.mkDerivation {
   ];
   patchPhase =
     let
-      excluded = [
-        ".*flake\\.nix$"
-
-        "^docs/.*"
-      ];
-
       shouldExclude = relPath: lib.any (pattern: builtins.match pattern relPath != null) excluded;
 
       nixFiles =