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Fix a grammar mistake in serialization.md and don't imply _ is valid in dns hostnames #161

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Fix a grammar mistake in serialization.md and don't imply _ is valid in dns hostnames #161

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2 changes: 1 addition & 1 deletion serialization.md
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Expand Up @@ -75,7 +75,7 @@ This specification uses the following terms:
A collection of tags grouped under a common prefix (the name component before <code>:</code>).
For example, in an image tagged with the name <code>my-app:3.1.4</code>, <code>my-app</code> is the <i>Repository</i> component of the name.
A repository name is made up of slash-separated name components, optionally prefixed by a DNS hostname.
The hostname must follow comply with standard DNS rules, but may not contain <code>_</code> characters.
The hostname must comply with standard DNS rules (e.g. it may not contain <code>_</code> characters).
If a hostname is present, it may optionally be followed by a port number in the format <code>:8080</code>.
Name components may contain lowercase characters, digits, and separators.
A separator is defined as a period, one or two underscores, or one or more dashes.
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