When is it useful to include the code in a thesis?

I am writing my master of science thesis and I am not sure whether I should add some of the code I have written: they are not proper programs, but more like input files to be fed to a commercial program (Nastran) very popular in my field.

My concerns are related to the fact that I am not making any discovery, just applying the things I have learned reading the manual. Still, I feel the code will make the effort I put into the thesis to also learn this language clearer.