diff --git a/deepmd/pt/model/model/pair_tab.py b/deepmd/pt/model/model/pair_tab.py
index 29fedb920c..1d83c7e818 100644
--- a/deepmd/pt/model/model/pair_tab.py
+++ b/deepmd/pt/model/model/pair_tab.py
@@ -141,7 +141,7 @@ def forward_atomic(
         return {"energy": atomic_energy}
 
     def _check_table_upper_boundary(self):
-        """Update User Provided Table Based on `rcut`
+        """Update User Provided Table Based on `rcut`.
 
         This function checks the upper boundary provided in the table against rcut.
         If the table upper boundary values decay to zero before rcut, padding zeros will