diff --git a/Config.txt b/Config.txt
index badc21f..02b5003 100644
--- a/Config.txt
+++ b/Config.txt
@@ -20,3 +20,7 @@
 13102 - No valid time specified
 13103 - No chosen answer specified
 13104 - No game for specified user
+
+= rename.php =
+14101 - User name doesn't match rules
+14102 - User name already exists
diff --git a/Database.php b/Database.php
index b3ff83c..cc3b555 100644
--- a/Database.php
+++ b/Database.php
@@ -56,9 +56,9 @@ class Database
                 return 'Success.';
             case 10101:
                 return 'SQL statement did not give a result.';
-            case 11101:
+            case 11101 || 14101:
                 return 'User name does not match rules. User name must be 6 to 20 characters and consist of English letters and numbers only.';
-            case 11102:
+            case 11102 || 14102:
                 return 'User name already exists. Please pick a different name.';
             case 12101 || 13101:
                 return 'User ID not specified. This is an internal error.';
diff --git a/rename.php b/rename.php
new file mode 100644
index 0000000..ffdc1f3
--- /dev/null
+++ b/rename.php
@@ -0,0 +1,32 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: leanderschmedemann
+ * Date: 04/04/2017
+ * Time: 12:07
+ */
+
+    require_once('includes.inc.php');
+    define('PATTERN', '/^[a-zA-Z0-9 ]{6,20}$/');
+    $data = '';
+    $error = 0;
+    $name = isset($_GET['name']) ? $_GET['name'] : '';
+    $uid = md5(uniqid(rand(), true));
+    $db = new Database();
+
+    if(preg_match(PATTERN, $name) != 1) {
+        $error = 14101;
+    } else {
+        // Create user.
+        $db->query('UPDATE "Users" SET "name" = $1 WHERE "ID" = $2', array($name, $uid));
+        // Create error if user to create already exists.
+        if(preg_match('/violates unique constraint "Users_name_unique"/', pg_last_error()) == 1) {
+            $error = 14102;
+        } else {
+            $data = array('uid' => $uid, 'name' => $name);
+        }
+    }
+    $response = Database::create_response($data, $error);
+    print $response;
+
+?>
\ No newline at end of file