# Contributing to Invoice Ninja We welcome contributions! We'll improve this guide over time... *Please note: although our application is open-source we run a for-profit hosted service at [invoiceninja.com](https://www.invoiceninja.com).* Guidelines - Try to follow [PSR-2 guidlines](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md) - Create pull requests against the develop branch - Add translations in our [Transifex](https://www.transifex.com/invoice-ninja/) project