diff --git a/doc/Section_howto.html b/doc/Section_howto.html
index 521ab237e6..7aff4366c9 100644
--- a/doc/Section_howto.html
+++ b/doc/Section_howto.html
@@ -402,7 +402,7 @@ r0 of OH bond = 0.9572
theta of HOH angle = 104.52
These are the parameters to use for TIP3P with a long-range Coulombic -solver (Ewald or PPPM in LAMMPS): +solver (Ewald or PPPM in LAMMPS), see (Price) for details:
O mass = 15.9994
H mass = 1.008
@@ -1458,4 +1458,8 @@ Fischer, Gao, Guo, Ha, et al, J Phys Chem, 102, 3586 (1998).
(Jorgensen) Jorgensen, Chandrasekhar, Madura, Impey, Klein, J Chem Phys, 79, 926 (1983).
+ + +(Price) Price and Brooks, J Chem Phys, 121, 10096 (2004). +