> For the complete documentation index, see [llms.txt](https://docs.platform.softwareone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.platform.softwareone.com/modules-and-features/marketplace/agreements/edit-agreement-id.md).
# Add or update additional client ID
Add or update the additional client ID for an order.
The **Additional Client ID** field is a reference number associated with an agreement.
It is provided when an order is placed and, if included, appears in this field. If no number is entered at the time of ordering, you can add it manually later.
This reference is shown on your invoices as the **PO number** to help you match them for billing and invoicing purposes.
{% hint style="info" %}
If the number exceeds 20 characters, only the first 16 characters are shown on the invoice, followed by 3 dots (...). For more information, see [Understand your billing documents.](/modules-and-features/billing/understand-your-billing-documents.md)
{% endhint %}
### Add or update the additional client ID
To add or update the Additional Client ID:
1. Go to **Marketplace** > **Agreements**.
2. Select the required agreement.
3. On the agreement details page, select the **Details** tab, then select **Edit**.
Select Edit on the Details tab to update the additional client ID.
4. In the **Edit ID** dialog, add or update the client ID, then select **Save**.
---
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