Yes, you can manually edit them and add what ever is needed.

I hope that my talk from the last developer summit will soon be
available where I explain why these are all there. You can find the
slides here, but these are probably not enough:

  http://people.ipfire.org/~ms/talks/2015_-_Submitting_Patches.pdf

Otherwise this can be found here in a longer text:

  http://wiki.ipfire.org/devel/git/tags

Best,
-Michael

On Sat, 2015-12-12 at 13:52 +0100, Matthias Fischer wrote:
> Hi Michael,
> 
> On 12.12.2015 13:40, Michael Tremer wrote:
> > You could express this by adding an other Signed-off-by line with
> > Erik's details...
> > 
> > Do you want to resend the patch?
> 
> Yes. I never did this before, but I can try... ;-)
> 
> As I understand:
> 
> I add another line, saying:
> 
> ...
> Signed-off-by: Erik Kapfer <ummeegge(a)ipfire.org>
> ...
> 
> Would that be sufficient?
> 
> Best,
> Matthias
>