diff --git a/PDP11/pdp11_dz.c b/PDP11/pdp11_dz.c
index 22b05fd6..7ca11789 100644
--- a/PDP11/pdp11_dz.c
+++ b/PDP11/pdp11_dz.c
@@ -243,6 +243,7 @@ TMXR dz_desc = { 0, 0, 0, NULL };                       /* mux descriptor */
 #define DBG_RCV  TMXR_DBG_RCV                           /* display Received Data */
 #define DBG_RET  TMXR_DBG_RET                           /* display Read Data */
 #define DBG_MDM  TMXR_DBG_MDM                           /* display Modem Signals */
+#define DBG_CFG  TMXR_DBG_CFG                           /* display Line Configuration Changes */
 #define DBG_CON  TMXR_DBG_CON                           /* display connection activities */
 #define DBG_TRC  TMXR_DBG_TRC                           /* display trace routine calls */
 #define DBG_ASY  TMXR_DBG_ASY                           /* display Asynchronous Activities */
@@ -254,6 +255,7 @@ DEBTAB dz_debug[] = {
   {"RCV",    DBG_RCV, "Received Data"},
   {"RET",    DBG_RET, "Read Data"},
   {"MDM",    DBG_MDM, "Modem Signals"},
+  {"CFG",    DBG_CFG, "Line Configuration Changes"},
   {"CON",    DBG_CON, "connection activities"},
   {"TRC",    DBG_TRC, "trace routine calls"},
   {"ASY",    DBG_ASY, "Asynchronous Activities"},
diff --git a/PDP11/pdp11_vh.c b/PDP11/pdp11_vh.c
index cfda72cd..1b74fba2 100644
--- a/PDP11/pdp11_vh.c
+++ b/PDP11/pdp11_vh.c
@@ -445,6 +445,7 @@ static TMLX vh_parm[VH_MUXES * VH_LINES_ALLOC] = { { 0 } };
 #define DBG_XMT     TMXR_DBG_XMT                        /* display Transmitted Data */
 #define DBG_RCV     TMXR_DBG_RCV                        /* display Received Data */
 #define DBG_MDM     TMXR_DBG_MDM                        /* display Modem Signals */
+#define DBG_CFG     TMXR_DBG_CFG                        /* display Line Configuration Changes */
 #define DBG_CON     TMXR_DBG_CON                        /* display connection activities */
 #define DBG_TRC     TMXR_DBG_TRC                        /* display trace routine calls */
 #define DBG_ASY     TMXR_DBG_ASY                        /* display Asynchronous Activities */
@@ -461,6 +462,7 @@ DEBTAB vh_debug[] = {
   {"XMT",    DBG_XMT,    "Transmitted Data"},
   {"RCV",    DBG_RCV,    "Received Data"},
   {"MDM",    DBG_MDM,    "Modem Signals"},
+  {"CFG",    DBG_CFG,    "Line Configuration Changes"},
   {"CON",    DBG_CON,    "connection activities"},
   {"TRC",    DBG_TRC,    "trace routine calls"},
   {"ASY",    DBG_ASY,    "Asynchronous Activities"},