diff --git a/IBM360/ibm360_cdr.c b/IBM360/ibm360_cdr.c
index b21ef5d..a1c1507 100644
--- a/IBM360/ibm360_cdr.c
+++ b/IBM360/ibm360_cdr.c
@@ -102,9 +102,10 @@ UNIT                cdr_unit[] = {
 
 MTAB                cdr_mod[] = {
     {MTAB_XTD | MTAB_VUN, 0, "FORMAT", "FORMAT",
-               &sim_card_set_fmt, &sim_card_show_fmt, NULL},
+               &sim_card_set_fmt, &sim_card_show_fmt, NULL, 
+               "Set defualt format for reading cards in"},
     {MTAB_XTD | MTAB_VUN | MTAB_VALR, 0, "DEV", "DEV", &set_dev_addr,
-        &show_dev_addr, NULL},
+        &show_dev_addr, NULL, "Set device address"},
     {0}
 };