diff --git a/nemu/src/monitor/sdb/sdb.c b/nemu/src/monitor/sdb/sdb.c
index a2cbfee..a183c29 100644
--- a/nemu/src/monitor/sdb/sdb.c
+++ b/nemu/src/monitor/sdb/sdb.c
@@ -140,7 +140,7 @@ static int cmd_help_print(char *args, struct CMDTable* cur_cmd_table) {
   if (arg == NULL) {
     return -1;
   } else {
-    printf("Subcommand \n");
+    printf("nr_subcommand: %d\n", cur_cmd_table->nr_subcommand);
     for (i = 0; i < cur_cmd_table->nr_subcommand; i++) {
       if (strcmp(arg, cur_cmd_table[i].name) == 0) {
         printf("Subcommand \n");