Ping on map when an enemy Ryze ults

It's so unfair to wake up with at least a Ryze behind you when you dont even know where he came from if you don't pay attention. That teleport of his should ping danger for the enemy team just like Tham's ult does. It makes the border of the game flash for his allies but enemies don't get any warning if they are not paying attention on the ground of the game. There should be something. I know that this may sound stupid, and may sound like I am just like a salty kid but is annoying af when a wild ryze appear from nowhere to tear your poor nexus apart, because a ping or sign on the map would be too mainstream.