of the version in the archive
according to the git revision history.
+It is safer not to specify
+.IR previous-version ,
+and usually it's not needed.
+Just say
+.BR --overwrite ,
+unless you know what you are doing.
+
This option is useful if you are the maintainer, and you have
incorporated NMU changes into your own git workflow in a way that
doesn't make your branch a fast forward from the NMU.