diff --git a/doc/architecture.txt b/doc/architecture.txt
--- a/doc/architecture.txt
+++ b/doc/architecture.txt
@@ -58,6 +58,10 @@ Concepts:
       of actions a client may perform.
 
 - user: A user is an entity which is given access to a distren server.
+  - user identifiction: As users are per-server, a user shall be identified by the name of the
+      server he has an account on combined with his handle. A tilde prefixes the username to
+      differentiate this URL from a job's URL.
+      distren://<servername>/~<username> , like distren://ohnopub.net/~ohnobinki
 
 - file: There are different uses of files above and distributed rendering requires file distribution.
   - file identification: Every file mentioned above was at least in the context of a job. Thus,