diff --git a/gui/dewar_tree.py b/gui/dewar_tree.py
index 02fbc03c..186b1f03 100644
--- a/gui/dewar_tree.py
+++ b/gui/dewar_tree.py
@@ -181,7 +181,9 @@ def add_samples_to_puck_tree(
                 )
                 return
 
-            parentItem.setText(f"{index_label} pass-{sample['proposalID']}")
+            proposal_id_text = f"(pass-{sample['proposalID']})"
+            if not parentItem.text().endswith(proposal_id_text):
+                parentItem.setText(f"{parentItem.text()} -- {proposal_id_text}")
 
             position_s = f'{j+1}-{sample.get("name", "")}'
             item = QtGui.QStandardItem(