diff --git a/examples/water/lmp/in.lammps b/examples/water/lmp/in.lammps
index f38db5836b..ea3b5d52cd 100644
--- a/examples/water/lmp/in.lammps
+++ b/examples/water/lmp/in.lammps
@@ -11,7 +11,9 @@ read_data	water.lmp
 mass 		1 16
 mass		2 2
 
+# See https://deepmd.rtfd.io/lammps/ for usage
 pair_style	deepmd frozen_model.pb
+# If atom names (O H in this example) are not set in the pair_coeff command, the type_map defined by the training parameter will be used by default.
 pair_coeff  * *	O H
 
 velocity        all create 330.0 23456789
diff --git a/examples/water/lmp/in.plugin.lammps b/examples/water/lmp/in.plugin.lammps
index 40b40dbc03..366ee7f379 100644
--- a/examples/water/lmp/in.plugin.lammps
+++ b/examples/water/lmp/in.plugin.lammps
@@ -14,7 +14,9 @@ mass		2 2
 # load the deepmd plugin
 plugin load libdeepmd_lmp.so
 
+# See https://deepmd.rtfd.io/lammps/ for usage
 pair_style	deepmd frozen_model.pb
+# If atom names (O H in this example) are not set in the pair_coeff command, the type_map defined by the training parameter will be used by default.
 pair_coeff  * *	O H
 
 velocity        all create 330.0 23456789