diff --git a/campusapis/teaching/v1/teaching.proto b/campusapis/teaching/v1/teaching.proto
index f3c617b..24d36ed 100644
--- a/campusapis/teaching/v1/teaching.proto
+++ b/campusapis/teaching/v1/teaching.proto
@@ -489,6 +489,8 @@ message GetUnusedClassroomsRequest {
   int32 week = 4;
   //节次
   int32 section = 5;
+  //教学楼
+  int32 buildingID = 6;
 }
 
 message GetClassroomsResponse {