# Sign

Signing confirms a change or action in the system. It provides traceability and an audit trail.

### When signing is required

Signing is required for changes that affect system state.

Examples:

* changing user settings (such as email)
* measuring point calibration adjustments
* alarm acceptance and signing

The system stores the signing history in the database.

### User Signature form

When signing is required, the **User Signature** form opens.

![](https://content.gitbook.com/content/EANwXRnuP0ug8971viyg/blobs/OlHyVDcB4cv66mKAtpFw/image18.png)

If PIN is enabled for the system group and for your user, the form looks like this:

<figure><img src="https://3588014471-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEANwXRnuP0ug8971viyg%2Fuploads%2FLFElIYcRnh0wyK86r5WG%2Fimage.png?alt=media&#x26;token=4e68fc9d-8a60-413d-b5ae-545f4eedb253" alt="" width="407"><figcaption></figcaption></figure>

### Sign an action

{% stepper %}
{% step %}

### Enter credentials

Enter your username and password.

If PIN is enabled and selected, enter your PIN instead.
{% endstep %}

{% step %}

### Add a comment (recommended)

Add a short comment that explains the reason.

An administrator can make comments mandatory for a system group.
{% endstep %}

{% step %}

### Confirm

Click **Sign**.

Boomerang confirms when the change is completed.
{% endstep %}
{% endstepper %}

![](https://content.gitbook.com/content/EANwXRnuP0ug8971viyg/blobs/4u32oeiIWX7rx6rssroi/image19.png)