diff --git a/Development/app/src/main/java/djamelfel/gala/Read_QR_Code.java b/Development/app/src/main/java/djamelfel/gala/Read_QR_Code.java
index 2e410afcaa57ac3a6e93c9d7a50eed98194fb676..0c72509d6d7d60a8531c0a732f2468ce46804a55 100644
--- a/Development/app/src/main/java/djamelfel/gala/Read_QR_Code.java
+++ b/Development/app/src/main/java/djamelfel/gala/Read_QR_Code.java
@@ -206,6 +206,12 @@ public class Read_QR_Code extends ActionBarActivity implements View.OnClickListe
         }
     }
 
+    /**
+     *
+     * @param msg
+     * @param success
+     * @info print on screen a message in red if success in false or green if it's true
+     */
     public void display(String msg, boolean success) {
         LayoutInflater inflater = getLayoutInflater();
         View layout;
@@ -227,6 +233,13 @@ public class Read_QR_Code extends ActionBarActivity implements View.OnClickListe
         toast.show();
     }
 
+    /**
+     *
+     * @param msg
+     * @param keyString
+     * @param algo
+     * @return hmac in hex from a message, a key and an algorithm
+     */
     public static String hmacDigest(String msg, String keyString, String algo) {
         String digest = null;
         try {