diff --git a/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala b/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala
index c3a79b24ce3cefb1d6a35350fc9f9ce45659c671..c8f483f2d97917df98ac5978e2e1ebf942512fcf 100644
--- a/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala
+++ b/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala
@@ -330,6 +330,8 @@ object ConfigUtils extends Logging {
   trait ImplicitConversions {
     import scala.language.implicitConversions
 
+
+    //TODO: unit test on message
     private def requiredValue(value: ConfigValue): Unit = {
       if (!valueExists(value))
         throw new IllegalStateException("Value does not exist but is required, key: " + value.requestIndex.key +