diff --git a/src/main/java/SignUp.java b/src/main/java/SignUp.java
index ca443dd..fe9ada6 100644
--- a/src/main/java/SignUp.java
+++ b/src/main/java/SignUp.java
@@ -3,22 +3,24 @@ import java.io.FileWriter;
 import java.io.IOException;
 
 public class SignUp {
-    private String name;
+    private String userName;
     private String password;
+    private String birthday;
 
     // Constructor
-    public SignUp(String name, String password) {
-    this.name = name;
+    public SignUp(String name, String password, String birthday) {
+    this.userName = name;
     this.password = password;
+    this.birthday = birthday;
     }
 
     // Getters and Setters
-    public String getName() {
-    return name;
+    public String getUserName() {
+    return userName;
     }
 
-    public void setName(String name) {
-    this.name = name;
+    public void setName(String userName) {
+    this.userName = userName;
     }
 
     public String getPassword() {
@@ -28,10 +30,18 @@ public class SignUp {
     public void setPassword(String password) {
     this.password = password;
     }
+    
+    public String getBirthday() {
+        return birthday;
+        }
+
+        public void setBirthday(String birthday) {
+        this.birthday = birthday;
+        }
 
     // Function to create user with validation
-    public static SignUp createUser(String name, String password) {
-    	if (name == null || name.isEmpty()) {
+    public static SignUp createUser(String userName, String password, String birthday) {
+    	if (userName == null || userName.isEmpty()) {
         throw new IllegalArgumentException("Username cannot be empty");
         }
         if (password == null || password.isEmpty()) {
@@ -39,7 +49,7 @@ public class SignUp {
         }
         if (password.length() < 6) {
         throw new IllegalArgumentException("Password must be at least 6 characters long");
-        }    return new SignUp(name, password);
+        }    return new SignUp(userName, password, birthday);
     }
     
  // Function to save to JSON file, replace with database call later
@@ -56,11 +66,13 @@ public class SignUp {
     public static void main(String[] args) {
         try {
             // Example usage 
-            SignUp user = createUser("Test User", "TestPasswort");
+            SignUp user = createUser("Test User", "TestPasswort", "01.01.1900");
 
             // Example of accessing properties
-            System.out.println("User Name: " + user.getName());
+            System.out.println("User Name: " + user.getUserName());
             System.out.println("User Password: " + user.getPassword());
+            System.out.println("User Birthday: " + user.getBirthday());
+
 
             // Save user information to a JSON file
             user.saveToJsonFile("user.json");
diff --git a/user.json b/user.json
new file mode 100644
index 0000000..b8726e5
--- /dev/null
+++ b/user.json
@@ -0,0 +1 @@
+{"userName":"Test User","password":"TestPasswort","birthday":"01.01.1900"}
\ No newline at end of file