[Catalog-sig] What triggers treating long descriptions text as reST in PyPI?

[Jim Fulton]

Most of my packages' long descriptions are treated as reST. For example:

   http://www.python.org/pypi/zc.recipe.testrunner

However, for:

   http://www.python.org/pypi/zc.recipe.egg

the long description was treated as plain text.

What triggers treatment as reStructuredText?  Is this documented  
anywhere?

Jim

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