diff --git a/docs/SIDEBAR.md b/docs/SIDEBAR.md
index f1d5a23..e2341c4 100644
--- a/docs/SIDEBAR.md
+++ b/docs/SIDEBAR.md
@@ -55,7 +55,10 @@ only when their trigger holds. A payload that predates #102 (no usable
 `<detail>` is an agent-reported string (#105) — e.g. why a session is in
 `Error`. It sits right after the duration, in the muted style, and shows only
 while an agent-reported state is in force (see Precedence): when the report
-lapses at its TTL or is replaced, the detail goes with it.
+lapses at its TTL or is replaced, the detail goes with it. The detail
+truncates with `…` ahead of the trailing fragments — a long detail never
+pushes `<blocked work>`, `exited`, or `<command>` off the line, and neither
+client ever lets it wrap.
 
 `<command>` is optional and muted: the session's command line, shown only when
 the rendered name came from `metadata.name` and differs from the command (the