diff --git a/Readme.md b/Readme.md
index 0888691..ed2e913 100644
--- a/Readme.md
+++ b/Readme.md
@@ -14,4 +14,6 @@ ada_service -build_url | -build_url_s -identity <user>:<password>
 ```
 (e.g. `http://adadoc:85/meta/BD117E7D5CF0912AEA17B4DF33D63F7E/721b766531/ADA/WS`)
 and  `<hostname>` is the host name of the Miria agent mounting the local
-filesystem.
+filesystem.  
+
+*It is strongly recommended to have the `.miria` file with mode 640 or 600 since the URL allows control of the archive without additional authentication.*