how to add attribution in svg file?

i have an icon which i downloaded from svgrepo.com for an open source project and the icon( i.e svg) is licensed under https://creativecommons.org/licenses/by/4.0/. so i have to add attribution. i found there are many ways like adding tag to the website of license etc. but the thing is that i don't want any visual attribution. so how to add attribution in such a way that i only add attribution in svg file which will be not visual?