diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..286bcec
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,34 @@
+# Hi!
+Thanks to contribute in this project. **Changes and contributions must be added as pull request**
+
+## Add a new dictionary
+
+You can help to make this project better by adding a new dictionary of swear words in your native language. The dictionary file MUST follow this points:
+
+1. It must be a `.php` file in `src/dict`
+2. Its filename must be a valid language code, check [here](https://www.science.co.il/language/Locale-codes.php)
+3. It must return an array with your swear words
+4. You MUST use array brackets declaration instead of `array()` function.
+5. Each word must be in a single line
+6. Each word must be single quoted
+7. Each word MUST NOT contains accents
+
+### Example
+
+```php
+<?php
+  return [
+    'fuck',
+    'suck'
+  ];
+```
+
+**You should provide test of loading and using your dictionary.**
+
+## Extends a dictionary
+
+Also, you can contribute by adding new words in a existing dictionary. You MUST to follow from 5 to 7 in the points above.
+
+## Improvements
+
+Any other improvements are very welcome. Check for [issues](https://github.com/arandilopez/laravel-profane/issues). Remember to provide test for your changes.
diff --git a/README.md b/README.md
index 7292d47..894664d 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 
 I made this package to perform a validation for swearwords using Laravel validation service.
 
-## Instalation
+## Installation
 
 Install via composer
 ```shell
@@ -39,7 +39,7 @@ Publish vendor lang files if you need to replace by your own.
 php artisan vendor:publish
 ```
 
-## How to use
+## Usage
 
 This package register a custom validator. You can use in your controller's `validate` function.
 
@@ -107,6 +107,8 @@ If you're interesting in contributing code to this project, clone it by running:
 git clone git@github.com:arandilopez/laravel-profane.git
 ```
 
+Please read the [CONTRIBUTING](CONTRIBUTING.md) file.
+
 Pull requests are welcome, but please make sure you provide unit tests to cover your changes. **You can help to add and support more locales!**
 
 *Thanks to [@dorianneto](https://github.com/dorianneto) for his contributions.*