Z:gnu-www-ja-gpl-2.0-faq--86be75-The preamble and instructions/en

The preamble and instructions add up to some 5000 characters, less than 1/3 of the GPL's total size. They will not make a substantial fractional change in the size of a software package unless the package itself is quite small. In that case, you may as well use a simple all-permissive license rather than the GNU GPL.