diff --git a/nemu/src/monitor/monitor.c b/nemu/src/monitor/monitor.c
index bb5cea1..69d938b 100644
--- a/nemu/src/monitor/monitor.c
+++ b/nemu/src/monitor/monitor.c
@@ -73,8 +73,8 @@ static int parse_args(int argc, char *argv[]) {
     {"log"      , required_argument, NULL, 'l'},
     {"diff"     , required_argument, NULL, 'd'},
     {"port"     , required_argument, NULL, 'p'},
-    {"help"     , no_argument      , NULL, 'h'},
     {"elf"      , required_argument, NULL, 'f'},
+    {"help"     , no_argument      , NULL, 'h'},
     {0          , 0                , NULL,  0 },
   };
   int o;
@@ -92,7 +92,7 @@ static int parse_args(int argc, char *argv[]) {
         printf("\t-l,--log=FILE           output log to FILE\n");
         printf("\t-d,--diff=REF_SO        run DiffTest with reference REF_SO\n");
         printf("\t-p,--port=PORT          run DiffTest with port PORT\n");
-        printf("\t-f,--elf=PORT           elf file with debug info\n");
+        printf("\t-f,--elf=FILE           elf file with debug info\n");
         printf("\n");
         exit(0);
     }