diff --git a/src/MANYBODY/pair_tersoff.cpp b/src/MANYBODY/pair_tersoff.cpp
index 4ea83d6622..cfa42de6cc 100644
--- a/src/MANYBODY/pair_tersoff.cpp
+++ b/src/MANYBODY/pair_tersoff.cpp
@@ -12,7 +12,8 @@
 ------------------------------------------------------------------------- */
 
 /* ----------------------------------------------------------------------
-   Contributing author: Aidan Thompson (SNL)
+   Contributing author: Aidan Thompson (SNL) - original Tersoff implementation
+                        Wengen Ouyang (TAU) - Shift addition
 ------------------------------------------------------------------------- */
 
 #include "pair_tersoff.h"
@@ -688,8 +689,6 @@ void PairTersoff::attractive(Param *param, double prefactor,
   if (shift_flag == 1) {
     rijinv = 1.0/(rij - shift);
     rikinv = 1.0/(rik - shift);
-    //rijinv *= sqrt(rsqij/(rsqij + shift*shift - 2*sqrt(rsqij)*shift));
-    //rikinv *= sqrt(rsqik/(rsqik + shift*shift - 2*sqrt(rsqik)*shift));
   }
 
   ters_zetaterm_d(prefactor,rij_hat,rij,rijinv,rik_hat,rik,rikinv,fi,fj,fk,param);