There are a bunch of other cool features with notify-send

We can run a command and make it display in the notification:

notify-send <title> <`command`>

notify-send Date "`date`"

notify-send Disk "`df / -H`"

We can use icons with the notifications

notify-send -i <icon> <Message>

notify-send -i face-wink "Hello! January"

Really annoying pop up

notify-send  -t 0 "Bringing down the system"

and

notify-send <title> <message>

notify-send "who am i" "I am January"

For more options check here