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Add version information for mandatory variable syntax #9432

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Add version information for mandatory variable syntax #9432

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3 changes: 2 additions & 1 deletion _includes/content/compose-var-sub.md
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Expand Up @@ -34,7 +34,8 @@ provide inline default values using typical shell syntax:
- `${VARIABLE-default}` evaluates to `default` only if `VARIABLE` is unset
in the environment.

Similarly, the following syntax allows you to specify mandatory variables:
Similarly, the following syntax allows you to specify mandatory variables when
using **Compose 1.19.0+** or `docker stack deploy` **18.04.0+**:

- `${VARIABLE:?err}` exits with an error message containing `err` if
`VARIABLE` is unset or empty in the environment.
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