diff --git a/PDP11/pdp11_dl.c b/PDP11/pdp11_dl.c
index 045b6896..a1819e99 100644
--- a/PDP11/pdp11_dl.c
+++ b/PDP11/pdp11_dl.c
@@ -146,16 +146,16 @@ MTAB dli_mod[] = {
       &set_addr, &show_addr, NULL, "Bus address" },
     { MTAB_XTD|MTAB_VDV|MTAB_VALR, 1, "VECTOR", "VECTOR",
       &set_vec, &show_vec_mux, (void *) &dlx_desc, "Interrupt vector"  },
-    { MTAB_XTD | MTAB_VDV, 1, NULL, "DISCONNECT",
-      &tmxr_dscln, NULL, &dlx_desc },
+    { MTAB_XTD | MTAB_VDV | MTAB_VALR, 1, NULL, "DISCONNECT",
+      &tmxr_dscln, NULL, &dlx_desc, "Disconnect a specific line" },
     { UNIT_ATT, UNIT_ATT, "summary", NULL,
       NULL, &tmxr_show_summ, (void *) &dlx_desc },
     { MTAB_XTD | MTAB_VDV | MTAB_NMO, 1, "CONNECTIONS", NULL,
       NULL, &tmxr_show_cstat, (void *) &dlx_desc },
     { MTAB_XTD | MTAB_VDV | MTAB_NMO, 0, "STATISTICS", NULL,
       NULL, &tmxr_show_cstat, (void *) &dlx_desc },
-    { MTAB_XTD | MTAB_VDV, 0, "LINES", "LINES",
-      &dlx_set_lines, &tmxr_show_lines, (void *) &dlx_desc },
+    { MTAB_XTD | MTAB_VDV | MTAB_VALR, 0, "LINES", "LINES=n",
+      &dlx_set_lines, &tmxr_show_lines, (void *) &dlx_desc, "Display number of lines" },
     { 0 }
     };