diff --git a/request.go b/request.go
index 6cbe15a..032fc50 100644
--- a/request.go
+++ b/request.go
@@ -119,6 +119,7 @@
 
 // dubbo-remoting/dubbo-remoting-api/src/main/java/com/alibaba/dubbo/remoting/exchange/codec/ExchangeCodec.java
 // v2.5.4 line 204 encodeRequest
+// todo: attachments
 func packRequest(service Service, header DubboHeader, params interface{}) ([]byte, error) {
 	var (
 		err           error
diff --git a/response.go b/response.go
index b6151ec..c610d34 100644
--- a/response.go
+++ b/response.go
@@ -66,13 +66,13 @@
 
 		var resWithException, resValue, resNullValue int32
 		if atta {
-			resWithException = RESPONSE_WITH_EXCEPTION
-			resValue = RESPONSE_VALUE
-			resNullValue = RESPONSE_NULL_VALUE
-		} else {
 			resWithException = RESPONSE_WITH_EXCEPTION_WITH_ATTACHMENTS
 			resValue = RESPONSE_VALUE_WITH_ATTACHMENTS
 			resNullValue = RESPONSE_NULL_VALUE_WITH_ATTACHMENTS
+		} else {
+			resWithException = RESPONSE_WITH_EXCEPTION
+			resValue = RESPONSE_VALUE
+			resNullValue = RESPONSE_NULL_VALUE
 		}
 
 		if e, ok := ret.(error); ok { // throw error
@@ -105,7 +105,7 @@
 }
 
 // hessian decode response body
-// todo: need to read attachments, but don't known it's effect yet
+// todo: need to read attachments
 func unpackResponseBody(buf []byte, rspObj interface{}) error {
 	// body
 	decoder := NewDecoder(buf[:])