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Add note about referencing images by IDs in readme #138

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Nov 20, 2017
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Add note about referencing images by IDs in readme #138

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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -80,6 +80,8 @@ container-diff supports Docker images located in both a local Docker daemon and

Additionally, tarballs can be provided to the tool directly. Make sure your file has a valid tar extension (.tar, .tar.gz, .tgz).

**Note**: container-diff does not support references images by Docker ID directly. If your image only has an ID in your local Docker daemon, you'll need to tag it using `docker tag` before using it with container-diff.

### Authentication

Container-diff supports docker-credential-helpers for authentication when using a registry as an image source.
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