diff --git a/engine/types.ts b/engine/types.ts
index ea3f700..f71a58f 100644
--- a/engine/types.ts
+++ b/engine/types.ts
@@ -13,7 +13,7 @@ export interface Choice {
   targetScene: string
   conditions?: Condition[]
   effects?: Effect[]
-  timeLimit?: number
+  timeLimit?: number // 单位：秒，超时后自动选择第一项
 }
 
 export interface Condition {