how to use mash update ?

[Eric Zhong]

I can use mash to get all packages from koji with "mash dist-fc13"
When i have a new build , i don't  want to reget all packages form koji , i
just want to get the package like update .
can mash do that?
How to use mash to get update packages?

How to use these options below ,and What is their purpose？

  -p PREVIOUS, --previous=PREVIOUS
                        previous mash run to use as basis for createrepo
  -d DELTA, --delta=DELTA
                        previous directory to use for deltarpm creation

I can't find docs for mash, ^-^

Thanks
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