diff --git a/README.md b/README.md
index 2978b4d..e961d61 100644
--- a/README.md
+++ b/README.md
@@ -64,3 +64,6 @@ Other urls are:
 
 - `/:id` to get the default site to display the share.
 - `/s/:id` to get the shared file directly.
+
+When you request a shared file directly, you can add anything after a dot behind the id e.g. `/s/jW8ADy.png`.
+This is done to make the browser display the file correctly. On the server side, this will be stripped away.