Allow us to ping when we build Executioner's calling, Mortal Reminder, and Lord Dominiks.

Personally, I feel that you should be able to ping items like you can with Infinity edge or rabadons. Yes, they aren't as expensive buys such as those, but they definitely have game changing effects, especially Executioner's. It can also allow us to easily tell our teammates that they don't need to build another grievous wound item.