diff --git a/src/tencent_cos.cpp b/src/tencent_cos.cpp
index 904ea70..4371d22 100644
--- a/src/tencent_cos.cpp
+++ b/src/tencent_cos.cpp
@@ -259,7 +259,8 @@ void module::tencent_cos::regist(sol::state* lua)
         "new", sol::constructors<module::tencent_cos()>(),
         "upfile", &module::tencent_cos::upfile,
         "updata", &module::tencent_cos::updata,
-        "del", &module::tencent_cos::del
+        "del", &module::tencent_cos::del,
+        "exist", &module::tencent_cos::exist
     );
 }