diff --git a/PDP11/pdp11_rq.c b/PDP11/pdp11_rq.c
index 99a8fba6..ecd27207 100644
--- a/PDP11/pdp11_rq.c
+++ b/PDP11/pdp11_rq.c
@@ -1046,14 +1046,14 @@ MTAB rq_mod[] = {
       &rq_set_type, NULL, NULL, "Set RCF25 Disk Type" },
     { MTAB_XTD|MTAB_VUN, RA80_DTYPE, NULL, "RA80",
       &rq_set_type, NULL, NULL, "Set RA80 Disk Type" },
-    { MTAB_XTD|MTAB_VUN, RA8U_DTYPE, NULL, "RAUSER",
+    { MTAB_XTD|MTAB_VUN|MTAB_VALR, RA8U_DTYPE, NULL, "RAUSER=SIZE",
       &rq_set_type, NULL, NULL, "Set RAUSER=size Disk Type" },
     { MTAB_XTD|MTAB_VUN, 0, "TYPE", NULL,
       NULL, &rq_show_type, NULL, "Display device type" },
     { UNIT_NOAUTO, UNIT_NOAUTO, "noautosize", "NOAUTOSIZE", NULL, NULL, NULL, "Disables disk autosize on attach" },
     { UNIT_NOAUTO,           0, "autosize",   "AUTOSIZE",   NULL, NULL, NULL, "Enables disk autosize on attach" },
-    { MTAB_XTD|MTAB_VUN, 0, "FORMAT", "FORMAT",
-      &sim_disk_set_fmt, &sim_disk_show_fmt, NULL, "Set/Display disk format (SIMH, VHD, RAW)" },
+    { MTAB_XTD|MTAB_VUN|MTAB_VALR, 0, "FORMAT", "FORMAT={SIMH|VHD|RAW}",
+      &sim_disk_set_fmt, &sim_disk_show_fmt, NULL, "Display disk format" },
 #if defined (VM_PDP11)
     { MTAB_XTD|MTAB_VDV|MTAB_VALR, 004, "ADDRESS", "ADDRESS",
       &set_addr, &show_addr, NULL, "Bus address" },