diff --git a/lphybeast/src/main/java/lphybeast/tobeast/values/TimeTreeToBEAST.java b/lphybeast/src/main/java/lphybeast/tobeast/values/TimeTreeToBEAST.java
index 1164e96..df62d07 100644
--- a/lphybeast/src/main/java/lphybeast/tobeast/values/TimeTreeToBEAST.java
+++ b/lphybeast/src/main/java/lphybeast/tobeast/values/TimeTreeToBEAST.java
@@ -30,7 +30,10 @@ public TreeParser valueToBEAST(Value<TimeTree> timeTreeValue, BEASTContext conte
 
         TreeParser tree = new TreeParser();
         tree.setInputValue("newick", timeTree.toNewick(false));
+        // TODO seems IsLabelledNewick="true" causes the trouble when cares internal node index
         tree.setInputValue("IsLabelledNewick", true);
+        // IsLabelledNewick="true" Is the Newick tree labelled (alternatively contains node numbers).
+//        tree.setInputValue("IsLabelledNewick", false);
 
         TaxonSet taxa = new TaxonSet();
         List<Taxon> taxonList = context.createTaxonList(getTaxaNames(timeTree));