diff --git a/set1/chal1/src/main.rs b/set1/chal1/src/main.rs
index c9bc164..e912976 100644
--- a/set1/chal1/src/main.rs
+++ b/set1/chal1/src/main.rs
@@ -1,3 +1,9 @@
+////
+// Cryptopal set 1 chal 1 : https://cryptopals.com/sets/1/challenges/1
+// Run with :
+// cargo run -- 49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d
+////
+
 use std::env;
 
 fn hex_to_char(s: &str) -> Result<char, std::num::ParseIntError> {
@@ -13,7 +19,15 @@ fn main() {
         .map(|chunk| chunk.iter().collect::<String>())
         .collect::<Vec<_>>();
 
-    for s in split {
-        println!("{:?}", hex_to_char(s));
+    // Printing the string in Ascii format - for decoding example
+    for (i, s) in split.iter().enumerate() {
+        match hex_to_char(s) {
+            Ok(s) => print!("{}", s),
+            Err(e) => println!("\nError decoding char '{}' at index {}", e, i),
+        }
     }
+    println!();
+
+    // Now we can unroll the base64 algorithm
+    // We need to : http://www.herongyang.com/Encoding/Base64-Encoding-Algorithm.html
 }