docs: public static double bachelierOptionDelta(
  			double forward,
  			double volatility,
  			double optionMaturity,
  			double optionStrike,
  			double payoffUnit)
  	{
  		if(optionMaturity < 0) {
  			return 0;
  		}
  		else if(forward == optionStrike) {
  			return payoffUnit / 2;
  		}
  		else
  		{
  			// Calculate analytic value
  			double dPlus = (forward - optionStrike) / (volatility * Math.sqrt(optionMaturity));
  
  			double deltaAnalytic = NormalDistribution.cumulativeDistribution(dPlus) * payoffUnit;
  
  			return deltaAnalytic;
  		}
  	}