diff --git a/tests/emmet-core/test_electrodes.py b/tests/emmet-core/test_electrodes.py
index dc91b4734e..c71a1ef128 100644
--- a/tests/emmet-core/test_electrodes.py
+++ b/tests/emmet-core/test_electrodes.py
@@ -22,6 +22,7 @@
 def insertion_elec(test_dir):
     """
     Recycle the test cases from pymatgen
+    TODO: All thie can be serialized in battery_data.json after PR to pymatgen
     """
     entry_Li = ComputedEntry("Li", -1.90753119)
     entry_Mg = loadfn(test_dir / "Mg_batt.json")