> For the complete documentation index, see [llms.txt](https://help.brickspacelab.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.brickspacelab.com/paper/guides/products/custom-fields.md).
# Custom fields
The Custom field product block can be used to add additional fields to a product form. This can be used to collect more information. E.g. include a custom engraving field to let customers customize their purchase.
{% stepper %}
{% step %}
Go to **Online** **Store** > **Themes** > **Customize**
{% endstep %}
{% step %}
From the dropdown in the top bar select Product
You may want to create a new product template, if you want your custom field to show up on every product page then you can use the default product template. Otherwise you would want to create a new template.
{% endstep %}
{% step %}
On the lefthand side click **Add** **block** then select **Custom** **field**
{% endstep %}
{% step %}
Add a label and check Enable required field if you want to make this a mandatory field to use
{% endstep %}
{% step %}
Reposition the block - it’s best to place this just above the Buy buttons block
{% endstep %}
{% step %}
Hit **Save**
{% endstep %}
{% endstepper %}
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## 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, and the optional `goal` query parameter:
```
GET https://help.brickspacelab.com/paper/guides/products/custom-fields.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
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.
