diff --git a/doc/usage.md b/doc/usage.md
index ef67265..4ad8fb9 100644
--- a/doc/usage.md
+++ b/doc/usage.md
@@ -357,7 +357,9 @@ o kill reviewer
 o kill tester
 ```
 
-The agents have no knowledge of each other — the script holds all the routing logic.
+The script initializes the routing, but agents can discover other sessions
+via `session/idx` and write to their `prompt` files directly — coordination
+is a shared filesystem, not a master-slave topology.
 Each agent can use a different `agent=`, `backend=`, or `model=`.
 
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