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diff --git a/onegapdist.h b/onegapdist.h
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+++ b/onegapdist.h
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+#ifndef ONEGAPDIST_H
+#define ONEGAPDIST_H
+/*
+ *  onegapdist.h
+ *  Mothur
+ *
+ *  Created by Sarah Westcott on 5/7/09.
+ *  Copyright 2009 Schloss Lab UMASS Amherst. All rights reserved.
+ *
+ */
+
+#include "dist.h"
+
+
+/**************************************************************************************************/
+
+class oneGapDist : public Dist {
+	
+public:
+	
+	oneGapDist() {}
+	
+	void calcDist(Sequence A, Sequence B){
+		
+		int difference = 0;
+		int minLength = 0;
+		int openGapA = 0;
+		int openGapB = 0;
+		int start = 0;
+		
+		string seqA = A.getAligned();
+		string seqB = B.getAligned();
+		int alignLength = seqA.length();
+		
+		for(int i=0;i<alignLength;i++){
+			if((seqA[i] != '.' || seqB[i] != '.')){
+				start = i;
+				break;
+			}
+		}
+
+		for(int i=start;i<alignLength;i++){
+			if((seqA[i] == '-' && seqB[i] == '-') || (seqA[i] == '.' && seqB[i] == '-') || (seqA[i] == '-' && seqB[i] == '.')){	;	}
+			else if(seqA[i] == '.' && seqB[i] == '.'){
+				break;
+			}
+			else if(seqB[i] != '-' && (seqA[i] == '-' || seqA[i] == '.')){
+				if(openGapA == 0){
+					difference++;
+					minLength++;
+					openGapA = 1;
+					openGapB = 0;
+				}
+			}
+			else if(seqA[i] != '-' && (seqB[i] == '-' || seqB[i] == '.')){
+				if(openGapB == 0){
+					difference++;
+					minLength++;
+					openGapA = 0;
+					openGapB = 1;
+				}
+			}
+			else if(seqA[i] != '-' && seqB[i] != '-'){
+				if(seqA[i] != seqB[i]){
+					difference++;
+					minLength++;
+					openGapA = 0;
+					openGapB = 0;
+				}
+				else{
+					minLength++;
+					openGapA = 0;
+					openGapB = 0;
+				}
+			}
+		}
+	
+		if(minLength == 0)	{	dist = 1.0000;							}
+		else				{	dist = (double)difference / minLength;	}
+	}
+	
+};
+
+/**************************************************************************************************/
+
+#endif