diff --git a/Source/Assembler/main.c b/Source/Assembler/main.c
index 269be31..4c5ce76 100644
--- a/Source/Assembler/main.c
+++ b/Source/Assembler/main.c
@@ -1,5 +1,11 @@
 #include "../../Headers/Assembler/SagittariusAssembler.h"
-
+/**
+ * Usage: 
+ * 
+ * SagittariusAssembler <input_file_0> <input_file_1> ... -o <output_file>
+ * 
+ * If no output file is specified, the assembler will output to <intput_file_0>.out.
+ */
 int main(int ac,char** av){
     printf("Copyright (C) 2026 Creeper Lv.\n");    
     return 0;