> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/boomerang-3-user-manual/common_elements/sign.md).

# 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.

<img src="/files/TstBHMqh2bJmhjFwJHUO" alt="" width="375">

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

<figure><img src="/files/j3Xj6rBEbp7naou2qeNz" 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 %}

<img src="/files/in30Vidf8dzD3sRghMnz" alt="" width="563">


---

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