# desc

Adds a tooltip line to a fluid.

Place the object under `traits` in a fluid-property file.

## Fields

| Field | Meaning and default |
| - | - |
| `description` | Translation key of the tooltip line. |
| `hidden` | Shows the line only in the detailed tooltip when `true`. |

## Example

From `data/leafia/fluid_property/n2o.json`:

```json
{"desc": {"description": "hbmfluid.leafia.n2o.description", "hidden": false}}
```