diff --git a/main.cpp b/main.cpp
index 7491977..2e7bf5c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -32,21 +32,21 @@ void help()
 #endif
     <<"nasal <option>\n"
     <<"option:\n"
-    <<"    -h, --help      | get this help and exit.\n"
-    <<"    -v, --version   | get version of nasal interpreter.\n\n"
+    <<"   -h,   --help     | get this help and exit.\n"
+    <<"   -v,   --version  | get version of nasal interpreter.\n\n"
     <<"nasal [option...] <file> [argv...]\n"
     <<"option:\n"
-    <<"    -l,   --lex     | view token info.\n"
-    <<"    -a,   --ast     | view abstract syntax tree.\n"
-    <<"    -c,   --code    | view bytecode.\n"
-    <<"    -e,   --exec    | execute.\n"
-    <<"    -t,   --time    | get the running time.\n"
-    <<"    -d,   --detail  | get detail runtime crash info.\n"
+    <<"   -l,   --lex      | view token info.\n"
+    <<"   -a,   --ast      | view abstract syntax tree.\n"
+    <<"   -c,   --code     | view bytecode.\n"
+    <<"   -e,   --exec     | execute.\n"
+    <<"   -t,   --time     | get the running time.\n"
+    <<"   -d,   --detail   | get detail runtime crash info.\n"
     <<"                    | get detail linker path-not-found info.\n"
     <<"                    | get garbage collector info if didn't crash.\n"
-    <<"    -o,  --optimize | use optimizer(beta).\n"
+    <<"   -o,   --optimize | use optimizer(beta).\n"
     <<"                    | if want to use -op and run, please use -op -e/-t/-d.\n"
-    <<"    -dbg, --debug   | debug mode (this will ignore -t -d).\n"
+    <<"   -dbg, --debug    | debug mode (this will ignore -t -d).\n"
     <<"file:\n"
     <<"    input file name to execute.\n"
     <<"argv:\n"