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You can just provide a link to a rosinstall file with the package names and repositories you would like indexed. It's more flexible and also allows you to easily add more stacks later - all you have to do is update your rosinstall file and the indexer will pick up your new stacks next time it reads that file.

See this mailing list thread for some details: https://code.ros.org/lurker/message/20110816.202545.649d3b91.en.html