diff --git a/gui/dewar_tree.py b/gui/dewar_tree.py
index a8a4ab63..355dbc53 100644
--- a/gui/dewar_tree.py
+++ b/gui/dewar_tree.py
@@ -177,6 +177,8 @@ def add_samples_to_puck_tree(
                 )
                 return
 
+            parentItem.setText(f"{index_label} pass-{sample['proposalID']}")
+
             position_s = f'{j+1}-{sample.get("name", "")}'
             item = QtGui.QStandardItem(
                 QtGui.QIcon(ICON),