diff --git a/PDP11/pdp11_vh.c b/PDP11/pdp11_vh.c
index cec5045f..13e30131 100644
--- a/PDP11/pdp11_vh.c
+++ b/PDP11/pdp11_vh.c
@@ -267,7 +267,7 @@ static uint16   vh_loop[VH_MUXES]   = { 0 };    /* loopback status */
 /* One bit per controller: */
 static uint32   vh_rxi = 0; /* rcv interrupts */
 static uint32   vh_txi = 0; /* xmt interrupts */
-static uint32   vh_crit = 0;    /* FIFO.CRIT */
+static uint32   vh_crit = 0;/* FIFO.CRIT */
 
 static const int32 bitmask[4] = { 037, 077, 0177, 0377 };
 
@@ -366,9 +366,18 @@ static UNIT vh_unit[VH_MUXES] = {
 };
 
 static const REG vh_reg[] = {
-    { BRDATA (CSR,     vh_csr, DEV_RDX, 16, VH_MUXES) },
-    { GRDATA (DEVADDR, vh_dib.ba, DEV_RDX, 32, 0), REG_HRO },
-    { GRDATA (DEVVEC,  vh_dib.vec, DEV_RDX, 16, 0), REG_HRO },
+    { BRDATAD (CSR,         vh_csr, DEV_RDX, 16, VH_MUXES, "control/status register, boards 0 to 3") },
+    { BRDATAD (TIMER,     vh_timer, DEV_RDX, 16, VH_MUXES, "controller timeout, boards 0 to 3") },
+    { BRDATAD (MCOUNT,   vh_mcount, DEV_RDX, 16, VH_MUXES, "count down timer, boards 0 to 3") },
+    { BRDATAD (TIMEO,     vh_timeo, DEV_RDX, 16, VH_MUXES, "control/status register, boards 0 to 3") },
+    { BRDATAD (OVRRUN,   vh_ovrrun, DEV_RDX, 16, VH_MUXES, "line overrun bits, boards 0 to 3") },
+    { BRDATAD (STALL,     vh_stall, DEV_RDX, 16, VH_MUXES, "XOFF'd channels 1 bit/channel, boards 0 to 3") },
+    { BRDATAD (LOOP,       vh_loop, DEV_RDX, 16, VH_MUXES, "loopback status, boards 0 to 3") },
+    { GRDATAD (RCVINT,      vh_rxi, DEV_RDX, 32, 0,        "rcv interrupts 1 bit/channel") },
+    { GRDATAD (TXINT,       vh_txi, DEV_RDX, 32, 0,        "xmt interrupts 1 bit/channel") },
+    { GRDATAD (FIFOCRIT,   vh_crit, DEV_RDX, 32, 0,        "FIFO.CRIT 1 bit/channel") },
+    { GRDATA  (DEVADDR,  vh_dib.ba, DEV_RDX, 32, 0), REG_HRO },
+    { GRDATA  (DEVVEC,  vh_dib.vec, DEV_RDX, 16, 0), REG_HRO },
     { NULL }
 };