diff --git a/tasmota/include/tasmota_types.h b/tasmota/include/tasmota_types.h
index 16a29c6ae..3135b1995 100644
--- a/tasmota/include/tasmota_types.h
+++ b/tasmota/include/tasmota_types.h
@@ -180,7 +180,7 @@ typedef union {                            // Restricted by MISRA-C Rule 18.4 bu
   uint32_t data;                           // Allow bit manipulation using SetOption
   struct {                                 // SetOption146 .. SetOption177
     uint32_t use_esp32_temperature : 1;    // bit 0  (v12.1.1.1) - SetOption146 - (ESP32) Show ESP32 internal temperature sensor
-    uint32_t spare01 : 1;                  // bit 1
+    uint32_t mqtt_sserialreceived : 1;     // bit 1  (v12.x.x.x) - SetOption147 - (MQTT) Enable publish SSerialReceived MQTT messages. If disabled, use event rules instead.
     uint32_t spare02 : 1;                  // bit 2
     uint32_t spare03 : 1;                  // bit 3
     uint32_t spare04 : 1;                  // bit 4