diff --git a/src/spicelib/devices/bsim4/b4.c b/src/spicelib/devices/bsim4/b4.c
index dc127136f..1f9ef1325 100644
--- a/src/spicelib/devices/bsim4/b4.c
+++ b/src/spicelib/devices/bsim4/b4.c
@@ -93,7 +93,7 @@ IOPR( "delvt0", BSIM4_DELVTO,  IF_REAL   , "Zero bias threshold voltage variatio
 IOP( "mulu0", BSIM4_MULU0, IF_REAL, "Low field mobility multiplier"),
 IOP( "xgw",  BSIM4_XGW, IF_REAL, "Distance from gate contact center to device edge"),
 IOP( "ngcon", BSIM4_NGCON, IF_REAL, "Number of gate contacts"),
-
+IOP( "wnflag", BSIM4_WNFLAG, IF_REAL, "W/NF device flag for bin selection"),
 
 IOP( "trnqsmod", BSIM4_TRNQSMOD, IF_INTEGER, "Transient NQS model selector"),
 IOP( "acnqsmod", BSIM4_ACNQSMOD, IF_INTEGER, "AC NQS model selector"),
diff --git a/src/spicelib/devices/bsim4/b4ask.c b/src/spicelib/devices/bsim4/b4ask.c
index 3f95cd9eb..b81cebd57 100644
--- a/src/spicelib/devices/bsim4/b4ask.c
+++ b/src/spicelib/devices/bsim4/b4ask.c
@@ -158,6 +158,9 @@ BSIM4instance *here = (BSIM4instance*)inst;
         case BSIM4_MULU0:
             value->rValue = here->BSIM4mulu0;
             return(OK);
+        case BSIM4_WNFLAG:
+            value->rValue = here->BSIM4wnflag;
+            return(OK);
         case BSIM4_XGW:
             value->rValue = here->BSIM4xgw;
             return(OK);
diff --git a/src/spicelib/devices/bsim4/b4par.c b/src/spicelib/devices/bsim4/b4par.c
index b57337d23..e7cdcaa82 100644
--- a/src/spicelib/devices/bsim4/b4par.c
+++ b/src/spicelib/devices/bsim4/b4par.c
@@ -185,6 +185,10 @@ IFvalue *select)
             here->BSIM4mulu0 = value->rValue;
             here->BSIM4mulu0Given = TRUE;
             break;
+        case BSIM4_WNFLAG:
+            here->BSIM4wnflag = value->rValue;
+            here->BSIM4wnflagGiven = TRUE;
+            break;
         case BSIM4_XGW:
             here->BSIM4xgw = value->rValue;
             here->BSIM4xgwGiven = TRUE;
diff --git a/src/spicelib/devices/bsim4/bsim4def.h b/src/spicelib/devices/bsim4/bsim4def.h
index fcb7864ed..9706d1d82 100644
--- a/src/spicelib/devices/bsim4/bsim4def.h
+++ b/src/spicelib/devices/bsim4/bsim4def.h
@@ -152,6 +152,7 @@ typedef struct sBSIM4instance
 
     double BSIM4delvto;
     double BSIM4mulu0;
+    double BSIM4wnflag;
     double BSIM4xgw;
     double BSIM4ngcon;
 
@@ -339,6 +340,7 @@ typedef struct sBSIM4instance
     unsigned BSIM4rbpsGiven   :1;
     unsigned BSIM4delvtoGiven   :1;
     unsigned BSIM4mulu0Given   :1;
+    unsigned BSIM4wnflagGiven   :1;
     unsigned BSIM4xgwGiven   :1;
     unsigned BSIM4ngconGiven   :1;
     unsigned BSIM4icVDSGiven :1;
@@ -2811,6 +2813,7 @@ typedef struct sBSIM4model
 #define BSIM4_SC                  37
 #define BSIM4_M                   38
 #define BSIM4_MULU0               39
+#define BSIM4_WNFLAG              40
 
 /* Global parameters */
 #define BSIM4_MOD_TEMPEOT         65
diff --git a/src/spicelib/devices/bsim4v7/b4v7.c b/src/spicelib/devices/bsim4v7/b4v7.c
index 0b4e32c65..7a4317e6a 100644
--- a/src/spicelib/devices/bsim4v7/b4v7.c
+++ b/src/spicelib/devices/bsim4v7/b4v7.c
@@ -56,7 +56,7 @@ IOPR( "delvt0", BSIM4v7_DELVTO,  IF_REAL   , "Zero bias threshold voltage variat
 IOP( "mulu0", BSIM4v7_MULU0, IF_REAL, "Low field mobility multiplier"),
 IOP( "xgw",  BSIM4v7_XGW, IF_REAL, "Distance from gate contact center to device edge"),
 IOP( "ngcon", BSIM4v7_NGCON, IF_REAL, "Number of gate contacts"),
-IOP( "wnflag", BSIM4v7_WNFLAG, IF_REAL, "Number of gate contacts"),
+IOP( "wnflag", BSIM4v7_WNFLAG, IF_REAL, "W/NF device flag for bin selection"),
 
 IOP( "trnqsmod", BSIM4v7_TRNQSMOD, IF_INTEGER, "Transient NQS model selector"),
 IOP( "acnqsmod", BSIM4v7_ACNQSMOD, IF_INTEGER, "AC NQS model selector"),