diff --git a/lab3/zad2/app/src/main/java/pl/jacekpoz/User.java b/lab3/zad2/app/src/main/java/pl/jacekpoz/User.java
index 54dd073..7168309 100644
--- a/lab3/zad2/app/src/main/java/pl/jacekpoz/User.java
+++ b/lab3/zad2/app/src/main/java/pl/jacekpoz/User.java
@@ -19,18 +19,18 @@ public class User<T extends IGF, D extends IDHSetup<T>> {
         return this.dh.power(dh.getGenerator(), this.secret);
     }
 
-    public void setKey(T a) {
+    public void setKey(final T a) {
         this.key = this.dh.power(a, this.secret);
     }
 
-    public T encrypt(T m) throws IllegalArgumentException {
+    public T encrypt(final T m) throws IllegalArgumentException {
         if (this.key.isZero()) {
             throw new IllegalArgumentException("key must be set before encrypting");
         }
         return (T) m.multiply(this.key);
     }
 
-    public T decrypt(T c) throws IllegalArgumentException {
+    public T decrypt(final T c) throws IllegalArgumentException {
         if (this.key.isZero()) {
             throw new IllegalArgumentException("key must be set before decrypting");
         }