diff --git a/weed/storage/backend/s3_backend/s3_backend.go b/weed/storage/backend/s3_backend/s3_backend.go
index 665f0b9b9..458111f09 100644
--- a/weed/storage/backend/s3_backend/s3_backend.go
+++ b/weed/storage/backend/s3_backend/s3_backend.go
@@ -127,11 +127,11 @@ func (s3backendStorageFile S3BackendStorageFile) ReadAt(p []byte, off int64) (n
 }
 
 func (s3backendStorageFile S3BackendStorageFile) WriteAt(p []byte, off int64) (n int, err error) {
-	panic("implement me")
+	panic("not implemented")
 }
 
 func (s3backendStorageFile S3BackendStorageFile) Truncate(off int64) error {
-	panic("implement me")
+	panic("not implemented")
 }
 
 func (s3backendStorageFile S3BackendStorageFile) Close() error {