New requirement for conforming alternate versions

Currently, The requirements for a conforming alternate version are laid out in the glossary definition.  However, there are two big things missing from these requirements in my opinion:

1.       There's no requirement to actually label a link to a conforming alternate as such, and thus how would the user know?

2.       There's no requirement to tell the user what is altered so they can judge whether they need such a version.

I filed this a few weeks ago on GitHub and hoping to get some more quick feedback: https://github.com/w3c/wcag21/issues/306

And here's the new definition being proposed: http://rawgit.com/w3c/wcag21/label-conforming-alternates/guidelines/terms/20/conforming-alternate-version.html

Steve Repsher
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