diff --git a/docs/tutorials/address-book.md b/docs/tutorials/address-book.md
index 3e356eb455..279bf44967 100644
--- a/docs/tutorials/address-book.md
+++ b/docs/tutorials/address-book.md
@@ -1168,7 +1168,7 @@ export async function action({
   params,
   request,
 }: Route.ActionArgs) {
-  invariant(params.contactId, "Missing contactId param");
+  //invariant(params.contactId, "Missing contactId param"); // What is this?
   const formData = await request.formData();
   const updates = Object.fromEntries(formData);
   await updateContact(params.contactId, updates);