Where to append kernel config fragment


I’m working with a ccimx6ulstarter and would like to edit my kernel configuration, with $ bitbake linux-dey -c diffconfig I have created a fragment.cfg but I’m not entirely sure to which file it should be appended to using:

SRC_URI_append = " \ 
file://fragment.cfg \ 

to make sure, it gets built into my next build. Can someone point me to the correct .bb file? I’m using ccimx6ulstarter_dey-3.2 to build the package