diff --git a/public/java/src/org/broadinstitute/sting/gatk/walkers/phasing/MergeAndMatchHaplotypes.java b/public/java/src/org/broadinstitute/sting/gatk/walkers/phasing/MergeAndMatchHaplotypes.java
index 4da049b39..298d8d6c8 100644
--- a/public/java/src/org/broadinstitute/sting/gatk/walkers/phasing/MergeAndMatchHaplotypes.java
+++ b/public/java/src/org/broadinstitute/sting/gatk/walkers/phasing/MergeAndMatchHaplotypes.java
@@ -17,6 +17,9 @@ import org.broadinstitute.sting.utils.variantcontext.VariantContextUtils;
 
 import java.util.*;
 
+/**
+ * Merges read-back-phased and phase-by-transmission files.
+ */
 public class MergeAndMatchHaplotypes extends RodWalker<Integer, Integer> {
     @Output
     protected VCFWriter vcfWriter = null;