# `TF010` Writing properties

We can associate any key-value to a requirement

:::{dropdown} Is a test for
:open: 
:icon: check-circle-fill
:color: primary

[`SF011` Support free key:value](/requirements/SF011)
:::

## Initial state
The expected state is the final state of
[`TF002` Generate a PDF](/tests/TF002)
## Procedure
### Step 1
Add properties to the second requirement
```console
$ cat specs.yaml
```
```yaml
kind: requirements
category: functional
requirements:
- id: S01
  short: Lorem ipsum
  long: The first requirement
- id: S02
  long: The second requirement
  properties:
    foo: bar
    baz: 17

```
### Step 2
Regenerate the PDF and verify that the properties correctly appear in `S02`
```console
$ typst compile specification.typ --open
```