Ping to warn team of incoming skills/missiles such as Ezreal's and Jinx's ult

Riot should add a ping that warns your teammate of incoming skills such as Ezreal's ult and Jinx's ult. The ping could show the path of the skill shot, or it could just be like the normal pings, but instead of "Danger" or "Fall back", it should be "Incoming Skill" and the players could ping in a line--according to the path of the skills.

This is my first post, I hope you guys could understand what I mean.

P.S. Ban Teemo :3