I think that is sufficient to make it GPLv3 licensed, but it places a bit of a burden on anyone who wants to redistribute it: > 4. Conveying Verbatim Copies.

I think that is sufficient to make it GPLv3 licensed, but it places a bit of a burden on anyone who wants to redistribute it: > 4. Conveying Verbatim Copies. > You may convey verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice; keep intact all notices stating that this License and any non-permissive terms added in accord with section 7 apply to the code; keep intact all notices of the absence of any warranty; and give all recipients a copy of this License along with the Program. If you want to redistribute it you have to go to your own efforts to give everyone you distribute it to a copy of the GPLv3 text.