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Update docs regarding shell expansion. #59

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Update docs regarding shell expansion. #59

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4 changes: 2 additions & 2 deletions _docs/configuration.md
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Expand Up @@ -346,11 +346,11 @@ servers:

## Using shell expansion

You can use shell expansion to interpolate values from the host machine into labels with the `${}` syntax. Anything within the curly braces will be executed on the host machine and the result will be interpolated into the label.
You can use shell expansion to interpolate values from the host machine into labels with the `$()` syntax. Anything within the parentheses will be executed on the host machine and the result will be interpolated into the label.

```yaml
labels:
host-machine: "${cat /etc/hostname}"
host-machine: "$(cat /etc/hostname)"
```

**Note:** Any other occurrence of `$` will be escaped to prevent unwanted shell expansion!
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