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firmware/controllers/algo/engine_state.h

@@ -55,6 +55,9 @@ public:
 	angle_t mapAveragingStart[INJECTION_PIN_COUNT];
 	angle_t mapAveragingDuration = 0;
 
+	/**
+	 * timing advance is angle distance before Top Dead Center (TDP), i.e. "10 degree timing advance" means "happens 10 degrees before TDC"
+	 */
 	angle_t timingAdvance = 0;
 	// fuel-related;
 	float fuelCutoffCorrection = 0;