diff --git a/doc/custom-service.md b/doc/custom-service.md
index 8559f65..f0c3552 100644
--- a/doc/custom-service.md
+++ b/doc/custom-service.md
@@ -98,7 +98,7 @@ Let's write the same `hello` service as above, in `hello.nix`, but this time as
     };
   };
   config = {
-    settings = {
+    outputs.settings = {
       processes.${name} = {
         command = "${lib.getExe config.package} --greeting='${config.message}'";
       };