diff --git a/lib.nix b/lib.nix
index 58b7e18..22da83d 100644
--- a/lib.nix
+++ b/lib.nix
@@ -13,6 +13,6 @@ rec {
         else if value == "directory" then
           walk-dir (path + "/${name}")
         else
-          builtins.throw "Item of type ${value} are unsupported.";
+          builtins.throw "Items of type ${value} are unsupported.";
     }) dir;
 }