diff --git a/README.md b/README.md
index 347ba22..f097e17 100644
--- a/README.md
+++ b/README.md
@@ -72,8 +72,7 @@ The radiator's own on/off switch picks a mode:
   vents only when it is nearly full: vent while less than **5%** of the
   network's heat storage is free, hold again once **10%** is free (a deadband
   so radiators do not chatter). The ship never overflows heat onto its own
-  parts, and thermal batteries stay topped up as a deep missile reserve. An
-  OFF radiator also releases its crew.
+  parts, and thermal batteries stay topped up as a deep missile reserve.
 
 The radiator measures the network itself, with a bare `NetworkResourceInput`
 — the same component an overclocked part pushes its heat through
@@ -142,16 +141,15 @@ Switch it **ON** and it runs constantly, exactly as in vanilla.
 
 ## Status
 
-**Release path confirmed, switch semantics not yet.** Against game 0.30.4c on
-2026-08-29, v3.0.0 in a real fight: radiators idled while the network filled,
-vented as it neared full, the ship never overheated, and they went quiet again
-once missiles drained the reserve.
+**Confirmed working.** Against game 0.30.4c on 2026-08-29, v4.0.0 in a real
+fight: radiators switched OFF idle while the network fills, vent as it nears
+full, the ship never overheats, and they go quiet again once missiles drain
+the reserve. Switched ON they vent constantly, as in vanilla.
 
-v4.0.0 changed only the gate: earlier builds required a launcher to broadcast
-"thermal ammo in use" over the heat network, which worked at load but did not
-follow the ammo selection live. The player's switch expresses the intent more
-directly, so the broadcast was removed and OFF now means "bank heat". That
-switch behaviour is the one thing v4.0.0 has not been played with yet.
+Earlier builds required a launcher to broadcast "thermal ammo in use" over the
+heat network, which worked at load but did not follow the ammo selection live.
+The player's switch expresses the intent more directly, so the broadcast was
+removed in v4.0.0 and OFF now means "bank heat".
 
 ### What the assembly says
 
diff --git a/mod.rules b/mod.rules
index a147b6d..12d92b6 100644
--- a/mod.rules
+++ b/mod.rules
@@ -34,7 +34,7 @@ Description = "Radiators switched OFF bank heat and vent only when the ship's he
               "- ON: vanilla. Vents constantly, the heat is gone.\n\n"\
               "- OFF: banks heat as a deep missile reserve. The radiator idles while the heat "\
               "network has room and vents as it approaches full, so the ship never overflows "\
-              "heat onto its own parts. An OFF radiator also frees its crew.\n\n"\
+              "heat onto its own parts.\n\n"\
               "- Fail-safe: idling requires measured headroom on the network. If that runs low, "\
               "or cannot be measured at all, radiators vent."