diff --git a/common/types/global.d.ts b/common/types/global.d.ts
index 55e047c..9ea07bf 100644
--- a/common/types/global.d.ts
+++ b/common/types/global.d.ts
@@ -9,6 +9,7 @@ export declare global {
          options: CtxOptions,
             userId: string
         ) => void;
+        user_undo(userId: string): void;
         mouse_moved: (x:number, y:number, socketId: string) => void;
         users_in_room: (socketIds: string[]) => void;
         user_disconnected: (socketId: string) => void;
diff --git a/server/index.ts b/server/index.ts
index 288ebf6..b7c2e2c 100644
--- a/server/index.ts
+++ b/server/index.ts
@@ -27,7 +27,7 @@ io.on("connection", (socket)=>{
 
     socket.on("draw", (moves, options)=>{
         console.log("drawing");
-        socket.broadcast.emit("socket_draw", moves, options);
+        socket.broadcast.emit("user_draw", moves, options, socket.id);
     });
 
     socket.on("mouse_move", (x,y) => {
@@ -36,6 +36,11 @@ io.on("connection", (socket)=>{
     
     });
 
+    socket.on("undo", ()=>{
+        console.log("undo");
+        socket.broadcast.emit("user_undo", socket.id);
+    });
+
     socket.on("disconnect", ()=>{
         console.log("disconnected");
     });