> For the complete documentation index, see [llms.txt](https://knowledgebase.qommentary.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledgebase.qommentary.com/qommentary-writeback/custom-data/adding-input-columns/checkbox.md).
# Checkbox
**Checkbox** controls are ideal for defining binary values with a choice between one of two possible mutually exclusive options (e.g. yes/no).
**Data type**: `boolean`
### Adding a Checkbox control
1\. Edit your sheet\
2\. Click on the **Qommentary Writeback** extension\
3\. Expand **Input Column** section\
4\. Click on **Add column**
5\. Select **Switch** from the dropdown menu
6\. Add a **label** to be displayed as a column header
7\. Add a **field** name
{% hint style="danger" %}
If database is selected as data connection, then field name **must map** to destination table column name.
{% endhint %}
{% hint style="warning" %}
Field name cannot contain spaces.
{% endhint %}
8\. Click on **Done**
**Checkbox** input column can now be updated and saved.
