diff --git a/src/spicelib/parser/inpptree.c b/src/spicelib/parser/inpptree.c
index ea9cb3cac..ca870cffb 100644
--- a/src/spicelib/parser/inpptree.c
+++ b/src/spicelib/parser/inpptree.c
@@ -158,7 +158,6 @@ static struct func {
     { "floor",  PTF_FLOOR,  (void(*)(void)) PTfloor } ,
     { "nint",   PTF_NINT,   (void(*)(void)) PTnint } ,
     { "-",      PTF_UMINUS, (void(*)(void)) PTuminus },
-    /* MW. cif function added */
     { "u2",     PTF_USTEP2, (void(*)(void)) PTustep2},
     { "pwl",    PTF_PWL,    (void(*)(void)) PTpwl},
     { "pwl_derivative", PTF_PWL_DERIVATIVE, (void(*)(void)) PTpwl_derivative},
@@ -545,8 +544,6 @@ static INPparseNode *PTdifferentiate(INPparseNode * p, int varnum)
             arg1 = mkcon(0.0);
             break;
 
-
-            /* MW. PTF_CIF for new cif function */
         case PTF_USTEP2: /* ustep2=uramp(x)-uramp(x-1) ustep2'=ustep(x)-ustep(x-1) */
             arg1 = mkb(PT_MINUS,
                        mkf(PTF_USTEP, p->left),