Update README.md

README.md

@@ -726,7 +726,7 @@ See https://github.com/n1trux/awesome-sysadmin#distributed-filesystems
 - [Uguu](https://uguu.se/) - Stores files and deletes after X amount of time. ([Source Code](https://github.com/nokonoko/uguu)) `MIT` `PHP`
 - [Up1](https://github.com/Upload/Up1) - Client-side Encrypted Image Host. `MIT` `Nodejs`
 - [uPste](https://u.pste.pw) - Private file hosting application with an emphasis on serving technology communities. ([Source Code](https://github.com/TheReverend403/uPste)) `AGPL-3.0` `PHP`
-- [XBackBone](https://github.com/SergiX44/XBackBone) - A simple, fast, lightweight and powerful ShareX PHP backend. `AGPL-3.0` `PHP`
+- [XBackBone](https://github.com/SergiX44/XBackBone) - A simple, fast, lightweight and powerful ShareX (a free and open-source screenshot utility for Windows) PHP backend. `AGPL-3.0` `PHP`
 - [YouTransfer](http://www.youtransfer.io) - YouTransfer is a simple but elegant self-hosted file transfer and sharing solution. ([Demo](http://demo.youtransfer.io/), [Source Code](https://github.com/remie/YouTransfer)) `Apache-2.0` `Nodejs`
 
 _Command-line file upload_