diff --git a/src/atomate2/vasp/sets/BaseMPGGASet.yaml b/src/atomate2/vasp/sets/BaseMPGGASet.yaml
index 9fd91f10ae..c7e7ce3d70 100644
--- a/src/atomate2/vasp/sets/BaseMPGGASet.yaml
+++ b/src/atomate2/vasp/sets/BaseMPGGASet.yaml
@@ -199,6 +199,8 @@ POTCAR:
   W: W_pv
   Xe: Xe
   Y: Y_sv
+  # 2023-05-02: change Yb_2 to Yb_3 as latter gives incorrect thermodynamics for most systems with Yb3+
+  # https://github.com/materialsproject/pymatgen/issues/2968
   Yb: Yb_3
   Zn: Zn
   Zr: Zr_sv
diff --git a/src/atomate2/vasp/sets/BaseVaspSet.yaml b/src/atomate2/vasp/sets/BaseVaspSet.yaml
index 98f8d8a87e..192cfa2343 100644
--- a/src/atomate2/vasp/sets/BaseVaspSet.yaml
+++ b/src/atomate2/vasp/sets/BaseVaspSet.yaml
@@ -213,6 +213,8 @@ POTCAR:
   W: W_sv
   Xe: Xe
   Y: Y_sv
+  # 2023-05-02: change Yb_2 to Yb_3 as latter gives incorrect thermodynamics for most systems with Yb3+
+  # https://github.com/materialsproject/pymatgen/issues/2968
   Yb: Yb_3
   Zn: Zn
   Zr: Zr_sv