diff --git a/doc/OBB矩形包围盒API.md b/doc/OBB矩形包围盒API.md
index 6f924a6..f80de84 100644
--- a/doc/OBB矩形包围盒API.md
+++ b/doc/OBB矩形包围盒API.md
@@ -77,6 +77,7 @@ getItemsByPositionDistance(x:number, z:number, distance:number): {item:ItemJson,
 
 ---
 
+(选择框)
 ### getItemsByRect(x1,y1,x2,y2): ItemJson[]
 
 根据矩形，获取与矩形有碰撞的所有物品集合