Add document with auto-generated ID in sub collection?

I’m trying to add a document with auto-generated ID in reviews/something using:

await addDoc(collection(dbFirestore, "reviews", route.params.id), {
  rating: rating,
  text: text,
  user: {
    id: user.id,
    username: user.username,
    avatar: user.avatar,
  },
});

But I get:

Invalid collection reference. Collection references must have an odd number of segments, but reviews/XXX has 2.

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>Solution :

Assume reviews is a collection and want to add a document (with auto generated id) to its subcollection

await addDoc(collection(dbFirestore, "reviews/document_id/subcollection"), {
  rating: rating,
  text: text,
  user: {
    id: user.id,
    username: user.username,
    avatar: user.avatar,
  },
});