diff --git a/protected/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/GenotypeConcordance.java b/protected/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/GenotypeConcordance.java
index 7991e3432..ff69b9b11 100644
--- a/protected/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/GenotypeConcordance.java
+++ b/protected/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/GenotypeConcordance.java
@@ -39,6 +39,16 @@ public class GenotypeConcordance extends RodWalker<Pair<VariantContext,VariantCo
     List<String> evalSamples;
     List<String> compSamples;
 
+    // todo -- integration test coverage
+    // todo -- deal with occurrences like:
+    //     Eval: 20   4000     A     C
+    //     Eval: 20   4000     A    AC
+    //     Comp: 20   4000     A     C
+    //  currently this results in a warning and skipping
+    // todo -- extend to multiple eval, multiple comp
+    // todo -- table with "proportion of overlapping sites" (not just eval/comp margins)
+
+
     public ConcordanceMetrics reduceInit() {
         Map<String,VCFHeader> headerMap = GATKVCFUtils.getVCFHeadersFromRods(getToolkit(), Arrays.asList(evalBinding,compBinding));
         VCFHeader evalHeader = headerMap.get(evalBinding.getName());
diff --git a/protected/java/test/org/broadinstitute/sting/gatk/walkers/variantutils/ConcordanceMetricsUnitTest.java b/protected/java/test/org/broadinstitute/sting/gatk/walkers/variantutils/ConcordanceMetricsUnitTest.java
index 9a5b18735..50d71c532 100644
--- a/protected/java/test/org/broadinstitute/sting/gatk/walkers/variantutils/ConcordanceMetricsUnitTest.java
+++ b/protected/java/test/org/broadinstitute/sting/gatk/walkers/variantutils/ConcordanceMetricsUnitTest.java
@@ -34,6 +34,11 @@ import net.sf.picard.reference.ReferenceSequenceFile;
 
 public class ConcordanceMetricsUnitTest extends BaseTest {
 
+    // todo -- coverage for several sites (3,4)
+    // todo -- coverage for calculation of table margins
+    // todo -- coverage for site concordance
+    // todo -- coverage for disjoint and mostly-disjoint sample sets
+
     private static ReferenceSequenceFile seq;
     private GenomeLocParser genomeLocParser;