The automatically generated patch puts this free form text on top of it.
If you are using gbp-buildpackage(1), you probably don't need this file.
If you are using dgit-maint-merge(7), please consider text as follows.
The Debian packaging of foo is maintained in git, using the merging workflow described in dgit-maint-merge(7). There isn't a patch queue that can be represented as a quilt series.
A detailed breakdown of the changes is available from their canonical representation - git commits in the packaging repository. For example, to see the changes made by the Debian maintainer in the first upload of upstream version 1.2.3, you could use: