#6 Minor license issue?

[Jens Seidel]

Hi,

I like the choosen ZLIB/LIBPNG license a lot! Thanks
for choosing it. Nevertheless I wonder about:

Permission to use, ... is hereby granted ... providing that both that copyright notice and this permission notice appear in supporting documentation.

which is part of each *.c file in src/. Doesn't it conflict with
"an acknowledgment in the product documentation would be appreciated but is not required." from the ZLIB/LIBPNG license?

I have especially problems understanding "supporting documentation" and assume it the same as product documentation?

Jens