x11-misc/i3status-2.13 (and x11-misc/i3status-2.12) display the following einfo message at the end of the build process:
> i3status can be used with any of the following programs:
> i3bar (x11-wm/i3)
> Please refer to manual: man i3status
According to https://dev.gentoo.org/~zmedico/portage/doc/ch06s02.html elog is a better choice, because this message is important and users should take notice.