diff --git a/readme.md b/readme.md
index 50e42b1..cbd5833 100644
--- a/readme.md
+++ b/readme.md
@@ -47,6 +47,8 @@ Push all URLs to the web archive:
 python do_archive.py urls_example.org_2023-01-01.txt
 ```
 
+Note: Strictly follow the scheme with url and date encoded into the file names.
+
 
 Dependencies
 ------------