diff --git a/README.md b/README.md
index 5c95525..b663cac 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ cargo run
 
 ## How to use 
 ```
+# Use "--" before argument if you run the project with cargo run
     --compress  , -c <intput> [<output>]     To compress a file.
     --uncompress, -u <intput> [<output>]     To uncompress a file.
     --print     , -p <input>                 To print a file compressed.