=item <upstream-commit-ish>
The new upstream branch (or commit-ish).
-Default is C<upstream>.
+The default is to look for one of these tags, in this order:
+U vU upstream/U;
+where U is the new upstream version.
+(This is the same algorithm as L<git-deborig(1)>.)
It is a snag if the upstream contains a debian/ directory;
if forced to proceed,
We may want to introduce an incompatible replacement syntax
under the name C<new-upstream>.
-=item git-debrebase make-patches
+=item git-debrebase make-patches [--quiet-would-amend]
Generate patches in debian/patches/
representing the changes made to upstream files.
changes to upstream files have been committed,
running it again can add the missing patches.
+If the patches implied by the current branch
+are not a simple superset of those already in debian/patches,
+make-patches will fail with exit status 7,
+and an error message.
+(The message can be suppress with --quiet-would-amend.)
+If the problem is simply that
+the existing patches were not made by git-debrebase,
+using dgit quilt-fixup instead should succeed.
+
=item git-debrebase convert-from-gbp [<upstream-commit-ish>]
Cnnverts a gbp patches-unapplied branch