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Update build_enhancements.md 

Included technical edits from @andrewhsu.
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Anne Henmi 2018-12-04 13:20:25 -07:00 committed by GitHub
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develop/develop-images/build_enhancements.md
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@ -99,7 +99,8 @@ $ docker build --progress=plain .
## Overriding default frontends
To override the default frontend, set the first line of the Dockerfile as a comment with a specific frontend image:
The new syntax features in `Dockerfile` are available if you override the default frontend. To override
the default frontend, set the first line of the `Dockerfile` as a comment with a specific frontend image:
```
# syntax = <frontend image>, e.g. # syntax = docker/dockerfile:1.0-experimental
```
@ -155,8 +156,7 @@ $ docker build --no-cache --progress=plain --secret id=mysecret,src=mysecret.txt
## Using SSH to access private data in builds
> **Acknowledgment**:
> Special thanks to [Tonis Tiigi](https://medium.com/@tonistiigi) for granting
> permission to use his blog post
> [Tonis Tiigi](https://medium.com/@tonistiigi) is granting Docker permission to use his blog post
> [Build secrets and SSH forwarding in Docker 18.09](https://medium.com/@tonistiigi/build-secrets-and-ssh-forwarding-in-docker-18-09-ae8161d066)
> as the basis of the content below.