diff --git a/set1/chal1/src/main.rs b/set1/chal1/src/main.rs
index 38086f6..cfeb3ed 100644
--- a/set1/chal1/src/main.rs
+++ b/set1/chal1/src/main.rs
@@ -11,7 +11,9 @@ use std::env;
 /// # Examples
 ///
 /// ~~~
-/// hex_to_string("49") => I
+///  let test: Vec<String> = vec![String::from("41"),
+///                               String::from("42")];
+///  assert_eq!(hex_to_string(&test), "AB");
 /// ~~~
 fn hex_to_string(hex_char: &Vec<String>) -> String {
   let mut output = String::new();
@@ -30,7 +32,7 @@ fn hex_to_string(hex_char: &Vec<String>) -> String {
 /// # Examples
 ///
 /// ~~~
-///  let test: Vec<u8> = vec![0x41, 0x42];
+///  let test: Vec<u8> = vec![0x41, 0x42];  // "[A,B] in ascii"
 ///  let b64_encode = base64_encode(&test);
 ///  assert_eq!(b64_encode, "QUI=");
 /// ~~~
@@ -91,11 +93,16 @@ fn base64_encode(input: &Vec<u8>) -> String {
 }
 
 fn main() {
-  // Test Base64 encode
-  let test: Vec<u8> = vec![0x41, 0x42]; // "[A,B] in ascii"
+  // Test base64 encode()
+  let test: Vec<u8> = vec![0x41, 0x42];
   let b64_encode = base64_encode(&test);
   assert_eq!(b64_encode, "QUI=");
 
+  // Test hex_to_string()
+  let test: Vec<String> = vec![String::from("41"),
+                               String::from("42")];
+  assert_eq!(hex_to_string(&test), "AB");
+
   let args: Vec<String> = env::args().collect();
   let input = &args[1];