# Product add-ons The purpose of `Product add-on` feature is to enable merchants to pick a product, not linked to a collection page, such as a newley created *warranty* product that can be purchased alongside the nominated product your customer may be interested in purchasing. {% embed url="" %} {% hint style="info" %} This block, which is only available for products, is not intended to be used as a cross-sell feature. You can only use this block type once on a product template page. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://erickson.gitbook.io/themes/erickson/faqs/subscriptions-1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.