diff --git a/README.md b/README.md
index a510d24..ab2db60 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,14 @@ npm install isikukood
 
 Download and include JS file into your HTML.
 ```html
-<script src="isikukood.js"></script>
+<script src="./dest/isikukood.js"></script>
 ```
+
+Using ES Modules
+```html
+import {Isikukood} from './dest/isikukood.mjs';
+```
+
 ## Usage
 Usage example.
 ```javascript
@@ -58,13 +64,13 @@ var maleIk = Isikukood.generate({
     <td>generate()</td>
     <td>Static function generates a valid personal ID.</td>
     <td>Object { gender: "male|female", birthDay: day, birthMonth: month, birthYear: year }.r Month are beginning from 1, eg. 1 is January, 2 is February etc.</td>
-    <td>String</td>
+    <td>string</td>
   </tr>
   <tr>
     <td>getGender()</td>
     <td>Get the gender of a person.</td>
     <td>-</td>
-    <td>String</td>
+    <td>string</td>
   </tr>
   <tr>
     <td>getBirthday()</td>
@@ -76,12 +82,39 @@ var maleIk = Isikukood.generate({
     <td>getAge()</td>
     <td>Get the birthday of a person in years.</td>
     <td>-</td>
-    <td>Number</td>
+    <td>number</td>
   </tr>
   <tr>
     <td>getControlNumber()</td>
     <td>Gets the control number of personal ID</td>
     <td>-</td>
-    <td>Number</td>
+    <td>number</td>
+  </tr>
+    <tr>
+    <td>parse()</td>
+    <td>Parses the code and return it's data as object.</td>
+    <td>-</td>
+    <td>object</td>
   </tr>
 </table>
+
+## Development
+Be sure that your [GNU Make](https://www.gnu.org/software/make/) software is installed on your system. Development commands are very simple.
+
+### Everything
+```sh
+make
+```
+
+### Build
+```sh
+make build
+```
+
+### Test
+```sh
+make test
+```
+
+## License
+[MIT License](https://mit-license.org/) 2022
diff --git a/demo.html b/demo.html
index b295258..d61d88e 100644
--- a/demo.html
+++ b/demo.html
@@ -31,7 +31,7 @@ <h4>Validate personal Estonian ID</h4>
   <output id="result" class="invalid"></output>
 </form>
 
-<script type="module" src="./dest/isikukood.min.js"></script>
+<script src="./dest/isikukood.min.js"></script>
 <script>
   document.addEventListener('DOMContentLoaded', () => {
     const form = document.getElementById('form-personal-id');
diff --git a/isikukood.js b/isikukood.js
index 53caa90..aafebfc 100644
--- a/isikukood.js
+++ b/isikukood.js
@@ -172,7 +172,7 @@ export class Isikukood {
   }
 
   /**
-   * Parses the code and return it's data.
+   * Parses the code and return it's data as object.
    * @param {string|number} [code]
    * @return {PersonalData}
    */