'NOTE' upon running ion.mdp

@jalemkul
GROMACS version: 2022.2
GROMACS modification:No
I executed gmx genion -s ions.tpr -o test_solv_ions.gro -p topol.top -pname NA -nname CL -conc 0.15 -neutral

It produced below note .

"NOTE 3 [file ../mdp_files/ions.mdp]:
  You are using a plain Coulomb cut-off, which might produce artifacts.
  You might want to consider using PME electrostatics."

What it means and what kind of artifacts will it generate?
Do I need to take some special measures while running ion.mdp?

Thanks

For adding ions, this note is irrelevant.

Thank you so much :)