1 files changed, 1 insertions, 0 deletions
diff --git a/webmap-download b/webmap-download
index 0165462..c2178f5 100755
--- a/webmap-download
+++ b/webmap-download
@@ -103,6 +103,7 @@ def download(url, dest, dir_fd=None, headers={}, session=requests, progress=None
             pbar.close()
 
     try:
+        # atomic rename (ensures output is never partially written)
         os.rename(dest_tmp, dest, src_dir_fd=dir_fd, dst_dir_fd=dir_fd)
     except (OSError, ValueError) as e:
         try: