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add documentation clarifying behavior of VOLUME instruction 

Signed-off-by: Patrick Hemmer <patrick.hemmer@gmail.com>
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Patrick Hemmer 2015-08-05 12:30:36 -04:00
parent 6206cbe193
commit 08a867b82f
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docs/reference/builder.md
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@ -912,6 +912,10 @@ This Dockerfile results in an image that causes `docker run`, to
create a new mount point at `/myvol` and copy the `greeting` file
into the newly created volume.
> **Note**:
> If any build steps change the data within the volume after it has been
> declared, those changes will be discarded.
> **Note**:
> The list is parsed as a JSON array, which means that
> you must use double-quotes (") around words not single-quotes (').