diff --git a/MarketDataLib/Generator/MovingAverageGenerator.cs b/MarketDataLib/Generator/MovingAverageGenerator.cs
index a5ce86c..be4b61e 100644
--- a/MarketDataLib/Generator/MovingAverageGenerator.cs
+++ b/MarketDataLib/Generator/MovingAverageGenerator.cs
@@ -114,20 +114,30 @@ namespace MarketData.Generator
         return null;
       }
     }
+
+    /// <summary>
+    /// The EMA coverage shoudld be the same as the simple moving average.  If you have 10 elements in the SMA then you should have 10 elements in the EMA
+    /// The EMA smooths the line by applying a smoothing (Beta) where Beta=1/(dayCount+1).  Foe example if you are wanting to calculate the
+    /// 20 day exponential moving average over a series then Beta=2/(20+1)=.095
+    /// The formula: EMA=prevEMA.AVGPrice+beta*(smaPrice.CurrentPrice - prevEMA.AVGPrice)
+    /// Tom Basso uses a 9 day(Fast) and 41 day(Slow) exponential moving average crossover to determine change in trend direction.
+    /// </summary>
+    /// <param name="prices"></param>
+    /// <param name="dayCount"></param>
+    /// <returns></returns>
     public static DMAPrices GenerateExponentialMovingAverage(Prices prices,int dayCount)
     {
       try
       {
         if(null==prices||prices.Count<dayCount+1)return null;  // (i.e.) a 20 day ExponentialMovingAverage requires 21 days of data
-        double smoothing=2.00/((double)dayCount+1.00);
+        double beta=2.00/((double)dayCount+1.00);
         DMAPrices emaPrices=new DMAPrices();
 
         DMAPrices smaPrices=GenerateMovingAverage(prices,dayCount);
         if(null==smaPrices||smaPrices.Count<dayCount)return null;
-        smaPrices=new DMAPrices(smaPrices.Top(dayCount));
         for(int index=0;index<smaPrices.Count;index++)
         {
-          DMAPrice smaPrice=smaPrices[index];                        // where yesterday is at index+1
+          DMAPrice smaPrice=smaPrices[index];                    
           DMAPrice emaPrice=new DMAPrice();
           if(0==index)
           {
@@ -141,7 +151,7 @@ namespace MarketData.Generator
             DMAPrice prevEMA=emaPrices[emaPrices.Count-1];
             emaPrice.Symbol=smaPrice.Symbol;
             emaPrice.Date=smaPrice.Date;
-            emaPrice.AVGPrice=(smaPrice.AVGPrice*(smoothing/(1.00+dayCount)))+(prevEMA.AVGPrice*(1.00-(smoothing/(1.00+dayCount))));
+            emaPrice.AVGPrice = prevEMA.AVGPrice+beta*(smaPrice.CurrentPrice - prevEMA.AVGPrice);
             emaPrices.Add(emaPrice);
           }
         }
@@ -153,6 +163,7 @@ namespace MarketData.Generator
         return null;
       }
     }
+
 /// <summary>Generates a dayCount moving average given prices.</summary>
     public static DMAPrices GenerateMovingAverage(Prices prices, int dayCount)
     {