diff --git a/dbcon/joblist/tuplehashjoin.cpp b/dbcon/joblist/tuplehashjoin.cpp
index dffc17ec9..368a15fdd 100644
--- a/dbcon/joblist/tuplehashjoin.cpp
+++ b/dbcon/joblist/tuplehashjoin.cpp
@@ -595,6 +595,8 @@ void TupleHashJoinStep::djsReaderFcn(int index)
 
   for (auto& diskJoinStep : djs)
   {
+    // TODO add and verify mutex 
+    // boost::mutex::scoped_lock lk(*fStatsMutexPtr);
     fExtendedInfo += diskJoinStep->extendedInfo();
     fMiniInfo += diskJoinStep->miniInfo();
   }