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 # Sentinel 65X SDK
 
-This package will provide a cross-developmnent SDK for Sentinel 65X, based around the Calypsi C compiler toolchain. This SDK will enable you to produce programs for Sentinel 65X using standard C library APIs, using a customized C library wrapped around the Sentinel 65X kernel interface.
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+This package will provide a cross-developmnent SDK for Sentinel 65X, based around the Calypsi C compiler toolchain. This SDK will enable you to produce programs for Sentinel 65X using standard C library APIs, using a customized C library wrapped around the Sentinel 65X kernel interface.
+
+## Requirements
+
+In order to use the SDK, you will need to have the Calypsi toolchain installed. This can be obtained at https://github.com/hth313/Calypsi-tool-chains/releases for macOS, Linux, and Windows.
+
+Additionally, the SDK assumes a Unix-like suite of command-line developmnent tools, including GNU Make.
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