diff --git a/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFConstants.java b/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFConstants.java
index f8714d0ca..c5bc119f0 100644
--- a/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFConstants.java
+++ b/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFConstants.java
@@ -144,6 +144,7 @@ public final class GATKVCFConstants {
     public static final String PON_FILTER_NAME =                              "panel_of_normals"; //M2
     public static final String STR_CONTRACTION_FILTER_NAME =                  "str_contraction"; //M2
     public static final String TUMOR_LOD_FILTER_NAME =                        "t_lod_fstar"; //M2
+    public static final String TRIALLELIC_SITE_FILTER_NAME =                  "triallelic_site"; //M2
 
     // Symbolic alleles
     public final static String SYMBOLIC_ALLELE_DEFINITION_HEADER_TAG = "ALT";
diff --git a/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFHeaderLines.java b/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFHeaderLines.java
index f5aa6bddf..e18e1b4ea 100644
--- a/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFHeaderLines.java
+++ b/public/gatk-utils/src/main/java/org/broadinstitute/gatk/utils/variant/GATKVCFHeaderLines.java
@@ -70,6 +70,7 @@ public class GATKVCFHeaderLines {
         addFilterLine(new VCFFilterHeaderLine(GATKVCFConstants.PON_FILTER_NAME, "Seen in at least 2 samples in the panel of normals"));
         addFilterLine(new VCFFilterHeaderLine(GATKVCFConstants.TUMOR_LOD_FILTER_NAME, "Tumor does not meet likelihood threshold"));
         addFilterLine(new VCFFilterHeaderLine(GATKVCFConstants.STR_CONTRACTION_FILTER_NAME, "Site filtered due to contraction of short tandem repeat region"));
+        addFilterLine(new VCFFilterHeaderLine(GATKVCFConstants.TRIALLELIC_SITE_FILTER_NAME, "Site filtered because more than two alt alleles pass tumor LOD"));
 
         addFormatLine(new VCFFormatHeaderLine(ALLELE_BALANCE_KEY, 1, VCFHeaderLineType.Float, "Allele balance for each het genotype"));
         addFormatLine(new VCFFormatHeaderLine(MAPPING_QUALITY_ZERO_BY_SAMPLE_KEY, 1, VCFHeaderLineType.Integer, "Number of Mapping Quality Zero Reads per sample"));