diff --git a/handler/ad.py b/handler/ad.py
index 5f7b93b..c3c2422 100644
--- a/handler/ad.py
+++ b/handler/ad.py
@@ -208,6 +208,7 @@ class Ad(Resource):
 				condition = f"id='{self.args['id']}'"
 				self.mydb.update("ad", ad, condition)
 				if rebuild_ad():
+					log.info(f"rebuild cache via ad change!")
 					return jsonify({'code': 200, 'message': 'update adid={id} success!'})
 				else:
 					return jsonify({'code': 500, 'message': 'rebuild cache failed!'})