diff --git a/src/wrappers/PhylogenyWrapper.js b/src/wrappers/PhylogenyWrapper.js
index 1db3aae9..72be599f 100644
--- a/src/wrappers/PhylogenyWrapper.js
+++ b/src/wrappers/PhylogenyWrapper.js
@@ -213,6 +213,9 @@ class PhylogenyWrapper {
     // If that doesn't work, we can try to extract scientific names from
     // the node label. Note that taxonomic units will NOT be extracted from
     // the label if there is a taxonomic unit present!
+    //
+    // Note that old-style taxonomic units were lists while new-style taxonomic
+    // units are single objects. So we turn it into a single entry list here.
     return [TaxonomicUnitWrapper.fromLabel(nodeLabel.trim())];
   }