[StGit] what happened to stg diff -r /{bottom|top}?

[Dan Williams <dan.j.williams@xxxxxxxxx>]

I noticed that with the latest StGit:
# stg diff -r /bottom
stg diff: /bottom: Unknown patch or revision name

Before I bisect to find where this disappeared, is there a different 
syntax I should be using?

Thanks,
Dan
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