diff --git a/src/component/types/messages.ts b/src/component/types/messages.ts
index 584ef6d6..3c60cca8 100644
--- a/src/component/types/messages.ts
+++ b/src/component/types/messages.ts
@@ -9,6 +9,7 @@ export interface Message {
 
 export interface SystemInit {
   event: string | undefined
+  member_id: string
   control_host: ControlHost
   screen_size: ScreenSize
   members: MemberData[]