diff --git a/firmware/controllers/algo/engine.cpp b/firmware/controllers/algo/engine.cpp
index da3bc4e660..e440261f1f 100644
--- a/firmware/controllers/algo/engine.cpp
+++ b/firmware/controllers/algo/engine.cpp
@@ -79,9 +79,9 @@ void Engine::updateSlowSensors(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
 	engineState.injectorLag = getInjectorLag(sensors.vBatt PASS_ENGINE_PARAMETER_SUFFIX);
 }
 
-void Engine::onTriggerEvent(efitick_t nowNt) {
+void Engine::onTriggerSignalEvent(efitick_t nowNt) {
 	isSpinning = true;
-	lastTriggerEventTimeNt = nowNt;
+	lastTriggerToothEventTimeNt = nowNt;
 }
 
 Engine::Engine() {
@@ -120,7 +120,7 @@ void Engine::reset() {
 	 * it's important for fixAngle() that engineCycle field never has zero
 	 */
 	engineCycle = getEngineCycle(FOUR_STROKE_CRANK_SENSOR);
-	lastTriggerEventTimeNt = 0;
+	lastTriggerToothEventTimeNt = 0;
 	isCylinderCleanupMode = false;
 	engineCycleEventCount = 0;
 	stopEngineRequestTimeNt = 0;
@@ -339,6 +339,8 @@ void Engine::watchdog() {
 #ifndef RPM_LOW_THRESHOLD
 #define RPM_LOW_THRESHOLD 240
 #endif
+// note that we are ignoring the number of tooth here - we
+// check for duration between tooth as if we only have one tooth per revolution which is not the case
 #define REVOLUTION_TIME_HIGH_THRESHOLD (60 * 1000000LL / RPM_LOW_THRESHOLD)
 	/**
 	 * todo: better watch dog implementation should be implemented - see
@@ -347,7 +349,7 @@ void Engine::watchdog() {
 	 * note that the result of this subtraction could be negative, that would happen if
 	 * we have a trigger event between the time we've invoked 'getTimeNow' and here
 	 */
-	efitick_t timeSinceLastTriggerEvent = nowNt - lastTriggerEventTimeNt;
+	efitick_t timeSinceLastTriggerEvent = nowNt - lastTriggerToothEventTimeNt;
 	if (timeSinceLastTriggerEvent < US2NT(REVOLUTION_TIME_HIGH_THRESHOLD)) {
 		return;
 	}
@@ -357,7 +359,7 @@ void Engine::watchdog() {
 	scheduleMsg(&logger, "engine has STOPPED");
 	scheduleMsg(&logger, "templog engine has STOPPED [%x][%x] [%x][%x] %d",
 			(int)(nowNt >> 32), (int)nowNt,
-			(int)(lastTriggerEventTimeNt >> 32), (int)lastTriggerEventTimeNt,
+			(int)(lastTriggerToothEventTimeNt >> 32), (int)lastTriggerToothEventTimeNt,
 			(int)timeSinceLastTriggerEvent
 			);
 	triggerInfo();
diff --git a/firmware/controllers/algo/engine.h b/firmware/controllers/algo/engine.h
index 960e1b75b4..2c78abacc8 100644
--- a/firmware/controllers/algo/engine.h
+++ b/firmware/controllers/algo/engine.h
@@ -415,10 +415,13 @@ public:
 	 */
 	int ignitionPin[IGNITION_PIN_COUNT];
 
-	void onTriggerEvent(efitick_t nowNt);
+	/**
+	 * this is invoked each time we register a trigger tooth signal
+	 */
+	void onTriggerSignalEvent(efitick_t nowNt);
 	EngineState engineState;
 	SensorsState sensors;
-	efitick_t lastTriggerEventTimeNt;
+	efitick_t lastTriggerToothEventTimeNt;
 
 
 	/**
diff --git a/firmware/controllers/trigger/trigger_central.cpp b/firmware/controllers/trigger/trigger_central.cpp
index 72c31bef9f..9d6cf7978c 100644
--- a/firmware/controllers/trigger/trigger_central.cpp
+++ b/firmware/controllers/trigger/trigger_central.cpp
@@ -252,7 +252,7 @@ void TriggerCentral::handleShaftSignal(trigger_event_e signal DECLARE_ENGINE_PAR
 
 	nowNt = getTimeNowNt();
 
-	engine->onTriggerEvent(nowNt);
+	engine->onTriggerSignalEvent(nowNt);
 
 #if EFI_HISTOGRAMS && EFI_PROD_CODE
 	int beforeCallback = hal_lld_get_counter_value();