New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/31367#discussion_r647698959

Comment:
You can add `mailnag/files/README.voidlinux` file containing this info, and install it in `post_install` with `vdoc $FILESDIR/README.voidlinux`. Having it in the template isn't much help to users,