diff --git a/docs/SIDEBAR.md b/docs/SIDEBAR.md
index 9728efc..6fffaeb 100644
--- a/docs/SIDEBAR.md
+++ b/docs/SIDEBAR.md
@@ -358,6 +358,11 @@ The TUI binds these through its keymap, so a user can rebind any of them; the
 web client's are fixed. A binding added to one client belongs in this table and
 in both help overlays.
 
+The TUI additionally binds `u` to resume the highlighted dormant session
+(#166, #169). The web client has no keystroke for it — its own resume
+affordance is the card's ↻ button and the context menu's **Resume** entry, per
+"Dormant cards" above — so this one has no web-side pair.
+
 ## Killing a session
 
 **Every kill confirms first, in both clients** (#160). A kill is destructive