diff --git a/src/main.rs b/src/main.rs
index 23cad86..f3375c7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,10 +17,8 @@ fn main() {
 
     let mut opts = Options::new();
 
-    opts.optflag("c", "", "create file");
-    opts.optflag("x", "", "extract file");
-    opts.optopt("i", "", "input file", "NAME");
-    opts.optopt("o", "", "output file", "NAME");
+    opts.optflag("c", "", "Compress file");
+    opts.optflag("x", "", "Extract file");
 
     let matches = match opts.parse(&args[1..]) {
         Ok(m) => { m }
@@ -28,14 +26,14 @@ fn main() {
     };
 
     if matches.opt_present("c") {
-        let input = matches.opt_str("i").unwrap();
-        let output = matches.opt_str("o").unwrap();
+        let input = &matches.free[0];
+        let output = &matches.free[1];
 
         create(&input, &output);
     }
     else if matches.opt_present("x") {
-        let input = matches.opt_str("i").unwrap();
-        let output = matches.opt_str("o").unwrap();
+        let input = &matches.free[0];
+        let output = &matches.free[1];
 
         extract(&input, &output)
     }
@@ -59,11 +57,11 @@ fn create(input: &String, output: &String) {
             }
         }
 
-        let mut out : Vec<u8> = vec![];
+        let mut index : Vec<u8> = vec![];
 
-        out.write_i32::<LittleEndian>(i).unwrap();
+        index.write_i32::<LittleEndian>(i).unwrap();
 
-        output_file.write_all(&out).unwrap();
+        output_file.write_all(&index).unwrap();
     }
 }