Fixed typo

README.md

@@ -2,7 +2,7 @@ Cobalt
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 ![Cobalt desktop](https://i.imgur.com/ZkTT3Yo.png)
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-Cobalt is a new operating system based on FreeDOS, designed to be easy to use. Unlike FreeDOS, Cobalt is designed for users with no previous DOS experience. Cobalt uses the FreeDOS 1.1 kernel, ensuring 100% compatbility with DOS programs and games.
+Cobalt is a new operating system based on FreeDOS, designed to be easy to use. Unlike FreeDOS, Cobalt is designed for users with no previous DOS experience. Cobalt uses the FreeDOS 1.1 kernel, ensuring 100% compatibility with DOS programs and games.
 
 Cobalt is still in development, so you might encounter bugs. It currently includes:
 
@@ -13,6 +13,8 @@ Cobalt is still in development, so you might encounter bugs. It currently includ
  * Support for CD/DVD drives
  * Support for [Long file names](https://en.wikipedia.org/wiki/Long_filename)
 
+If you have an existing computer (or virtual machine) with a DOS-based operating system, Cobalt will allow you to 'upgrade' over the existing OS.
+
 Cobalt is open source under the GPLv3 license.
 
 ### How to compile