diff --git a/README.md b/README.md
index 4765880..ff82e0f 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,32 @@ moodle_profilefield_cpf
 =======================
 
 Moodle user profile field for brazilian CPF
+-------------------------------------------
+
+A Moodle plugin that validates a Brazilian CPF
+
+Instalation instructions:
+'''''''''''''''''''''''''
+
+1. Clone the repository to a folder named cpf;
+2. Copy the folder cpf to user/profile/field directory on your moodle installation;
+3. Open custom field editor (Site administration->Users->Accounts->User profile fields);
+4. Choose Brazilian CPF in "Create new profile field" dropdown;
+5. Configure and save the field.
+
+In portuguese:
+=============
+
+Campo de perfil do Moodle para CPF brasileiro
+---------------------------------------------
+
+Um plugin Moodle que valida um CPF brasileiro
+
+Instruções de instalação:
+'''''''''''''''''''''''''
+
+1. Clone o repositório para uma pasta denominada cpf;
+2. Copie a pasta cpf para o diretório user/profile/field na sua instalação Moodle;
+3. Abra o editor de campos de perfil (Administração do site -> Usuários -> Contas -> Campos de perfil do usuário);
+4. Escolha Brazilian CPF na caixa de seleção "Criar um novo campo de perfil";
+5. Configure e salve o campo.
diff --git a/define.class.php b/define.class.php
new file mode 100644
index 0000000..b7a89c1
--- /dev/null
+++ b/define.class.php
@@ -0,0 +1,14 @@
+<?php
+
+class profile_define_cpf extends profile_define_base {
+
+    function define_form_specific($form) {
+        /// Default data
+        $form->addElement('text', 'defaultdata', get_string('profiledefaultdata', 'admin'), 'size="50"');
+        $form->setType('defaultdata', PARAM_TEXT);
+
+    }
+
+}
+
+
diff --git a/field.class.php b/field.class.php
new file mode 100644
index 0000000..f761b96
--- /dev/null
+++ b/field.class.php
@@ -0,0 +1,66 @@
+<?php
+
+class profile_field_cpf extends profile_field_base {
+
+    /**
+     * Overwrite the base class to display the data for this field
+     */
+    function display_data() {
+        /// Default formatting
+        $data = parent::display_data();
+        if ($data !== '') {
+            $data = substr($data,0,3).'.'.substr($data,3,3).'.'.substr($data,6,3).'-'.substr($data,9,2);
+        }
+/*
+        /// Are we creating a link?
+        if (!empty($this->field->param4) and !empty($data)) {
+
+            /// Define the target
+            if (! empty($this->field->param5)) {
+                $target = 'target="'.$this->field->param5.'"';
+            } else {
+                $target = '';
+            }
+
+            /// Create the link
+            $data = '<a href="'.str_replace('$$', urlencode($data), $this->field->param4).'" '.$target.'>'.htmlspecialchars($data).'</a>';
+        }
+*/
+        return $data;
+    }
+
+    function edit_field_add($mform) {
+        /// Create the form field
+        $mform->addElement('text', $this->inputname, format_string($this->field->name), 'maxlength="11" size="11"');
+        $mform->setType($this->inputname, PARAM_INT);
+    }
+
+    function edit_validate_field($usernew) {
+        // Based on script by Moacir, in http://codigofonte.uol.com.br/codigos/validacao-de-cpf-com-php
+        $errors = array();
+        if (isset($usernew->{$this->inputname})) {
+            $cpf = $usernew->{$this->inputname};
+            if (strlen($cpf) != 11) {
+                return array($this->inputname => get_string('cpf_size', 'profilefield_cpf'));
+            }
+            if (in_array($cpf, array('00000000000', '11111111111', '22222222222', '33333333333', '44444444444', '55555555555', '66666666666', '77777777777', '88888888888', '99999999999'))) {
+                return array($this->inputname => get_string('cpf_invalid', 'profilefield_cpf'));
+            }
+            for ($t = 9; $t < 11; $t++) {
+                for ($d = 0, $c = 0; $c < $t; $c++) {
+                    $v = substr($cpf,$c,1);
+                    $d += $v * (($t + 1) - $c);
+                }
+                $v = substr($cpf,$c,1);
+                $d = ((10 * $d) % 11) % 10;
+                if ($v != $d) {
+                    return array($this->inputname => get_string('cpf_invalid', 'profilefield_cpf'));
+                }
+            }
+        }
+        return $errors;
+    }
+
+}
+
+
diff --git a/lang/en/profilefield_cpf.php b/lang/en/profilefield_cpf.php
new file mode 100644
index 0000000..155f114
--- /dev/null
+++ b/lang/en/profilefield_cpf.php
@@ -0,0 +1,28 @@
+<?php
+
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Strings for component 'profilefield_text', language 'en', branch 'MOODLE_20_STABLE'
+ *
+ * @package   profilefield_text
+ * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+$string['pluginname'] = 'Brazilian CPF';
+$string['cpf_size'] = 'CPF must have 11 digits';
+$string['cpf_invalid'] = 'Invalid CPF';
diff --git a/version.php b/version.php
new file mode 100644
index 0000000..d1288b2
--- /dev/null
+++ b/version.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * @package    profilefield
+ * @subpackage text
+ * @copyright  2007 onwards Shane Elliot {@link http://pukunui.com}
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$plugin->version   = 2013050100;        // The current plugin version (Date: YYYYMMDDXX)
+$plugin->requires  = 2013050100;        // Requires this Moodle version
+$plugin->component = 'profilefield_cpf'; // Full name of the plugin (used for diagnostics)