diff --git a/Sensor-API.md b/Sensor-API.md
index 99029dee..809ac5d4 100644
--- a/Sensor-API.md
+++ b/Sensor-API.md
@@ -131,7 +131,7 @@ snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{s}MPR121%c Button%d{m}%d{e}"),
 It should be wrapped in `#ifdef USE_WEBSERVER ... #endif  // USE_WEBSERVER`
 
 ### FUNC_SAVE_BEFORE_RESTART
-This callback ID is called to allow a sensor to prepare for saving configuration changes. To be used to save volatile data just before a restart.
+This callback ID is called to allow a sensor to prepare for saving configuration changes. To be used to save volatile data just before a restart. Variables can be appended to `struct SYSCFG {} Settings` in file `sonoff/settings.h`.
 
 ### FUNC_COMMAND
 This callback ID is called when a sensor specific command ``Sensor<xx>`` is executed where xx is the sensor index.