diff --git a/integrations/mqtt_bridge/README.md b/integrations/mqtt_bridge/README.md
index 29d31b04..d3b66980 100644
--- a/integrations/mqtt_bridge/README.md
+++ b/integrations/mqtt_bridge/README.md
@@ -114,5 +114,7 @@ python3 integrations/mqtt_bridge/ledmatrix_mqtt_bridge.py --config integrations/
   discovery itself. Discovery is lazy and normally happens because somebody
   opened the dashboard; without that endpoint a bridge that never does would
   see an empty list.
-- Brightness writes `display.hardware.brightness` through `/api/v3/config/main`.
-  The display service picks it up on its next restart, not instantly.
+- Brightness writes `display.hardware.brightness` through `/api/v3/config/main`,
+  and changes nothing else. The running display service notices the saved
+  config within a few seconds and applies the new brightness without a
+  restart (unless `LEDMATRIX_HOT_RELOAD=false`).