diff --git a/src/spicelib/devices/dio/dio.c b/src/spicelib/devices/dio/dio.c
index 5498c803d..ed82c14c0 100644
--- a/src/spicelib/devices/dio/dio.c
+++ b/src/spicelib/devices/dio/dio.c
@@ -104,9 +104,9 @@ IFparm DIOmPTable[] = { /* model parameters */
  IOP( "fc",  DIO_MOD_FC,  IF_REAL, "Forward bias junction fit parameter"),
  IOP( "fcs",  DIO_MOD_FCS,  IF_REAL, "Forward bias sidewall junction fit parameter"),
  IOP( "bv",  DIO_MOD_BV,  IF_REAL, "Reverse breakdown voltage"),
- IOP( "vb",  DIO_MOD_BV,  IF_REAL, "Reverse breakdown voltage"),
- IOP( "vrb",  DIO_MOD_BV,  IF_REAL, "Reverse breakdown voltage"),
- IOP( "var",  DIO_MOD_BV,  IF_REAL, "Reverse breakdown voltage"),
+ IOP( "vb",  DIO_MOD_BV,  IF_REAL, "Reverse breakdown voltage (level=3)"),
+ IOP( "vrb",  DIO_MOD_BV,  IF_REAL, "Reverse breakdown voltage (level=3)"),
+ IOP( "var",  DIO_MOD_BV,  IF_REAL, "Reverse breakdown voltage (level=3)"),
  IOP( "ibv", DIO_MOD_IBV, IF_REAL, "Current at reverse breakdown voltage"),
  IOPR( "ib", DIO_MOD_IBV, IF_REAL, "Current at reverse breakdown voltage"),
  IOP( "tcv", DIO_MOD_TCV, IF_REAL, "Reverse breakdown voltage temperature coefficient"),