diff --git a/README.md b/README.md
index 1160852..5f90933 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Œufman
 ## How to use 
 ```
+    <input.oeuf>                             To open file with gui.
     --compress  , -c <intput> [<output>]     To compress a file.
     --uncompress, -u <intput> [<output>]     To uncompress a file.
     --print     , -p <input>                 To print a file compressed.
diff --git a/src/main.rs b/src/main.rs
index 6569777..b395ccc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
 #![allow(rustdoc::missing_crate_level_docs)] // it's an example
 use eframe::egui;
+use eframe::egui::debug_text::print;
 use std::env;
 use std::fs::File;
 use std::fs::OpenOptions;
@@ -126,7 +127,8 @@ fn main() -> std::io::Result<()> {
 }
 
 fn display_options() {
+    println!("<input.oeuf>                             To open file with gui.");
     println!("--compress  , -c <intput> [<output>]     To compress a file.");
-    println!("--uncompress, -u <intput> [<output>]     To uncompress a file.");
+    println!("--uncompress, -u <intput.oeuf> [<output>]     To uncompress a file.");
     println!("--print     ,-p  <input>                 To print a file compressed.");
 }