Update README.md

README.md

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 Download the Bela SD card image from the Releases link above.
 There currently are two different releases available, one stable and one testing.
 
-The stable release runs the basic Debian Wheezy distro with Xenomai extensions, with kernel Linux arm 3.8.13xenomai-bone41. Itcontains all the toolkits needed to compile and run Bela projects.
+The stable release runs the basic Debian Wheezy distro with Xenomai extensions, with kernel Linux arm 3.8.13xenomai-bone41. It contains all the toolkits needed to compile and run Bela projects.
 
 The testing release is the same as the stable but with a few additional packages which we installed through the Jessie repositories: gcc-4.9 and clang-3.6.
 
-Uncompress the image using @xz@ (which you may have to install) and flash it onto the SD card.
-A card of at least 2GB is required. This image contains a Debian 7.7 distribution with Xenomai extensions which
+Uncompress the image using *xz* (which you may have to install) and flash it onto the SD card.
+For instructions on how to do so, check out the [wiki page](https://github.com/BelaPlatform/bela-image/wiki)
+An SD card of at least 2GB is required for the stable release and at least 8GB for the testing release.
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