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jedevc merged 1 commit into from
Nov 13, 2025
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docs: document using build contexts to override syntax directive #3509

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9 changes: 7 additions & 2 deletions docs/reference/buildx_build.md
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Expand Up @@ -241,8 +241,13 @@ Learn more about the built-in build arguments in the [Dockerfile reference docs]
--build-context=name=VALUE
```

Define additional build context with specified contents. In Dockerfile the context can be accessed when `FROM name` or `--from=name` is used.
When Dockerfile defines a stage with the same name it is overwritten.
Define additional build context with specified contents.

In a Dockerfile:

- the context can be accessed when `FROM name` or `--from=name` is used
- the context overrides a stage called `name` when used as `FROM ... AS name`
- the context overrides a `#syntax` directive when used as `#syntax=name`

The value can be a:

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