A short note on requirements

Author: grantmd

README.md

@@ -9,3 +9,9 @@ Parts
 * STMicroelectronics STM32F4DISCOVERY board: http://www.st.com/internet/evalboard/product/252419.jsp
 * 66 Channel LS20031 GPS 5Hz Receiver: http://www.sparkfun.com/products/8975 (although any serial GPS will do)
 * Spektrum Remote/Satellite Receiver: http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPM9645
+
+Requirements
+------------
+
+* A copy of chibios in ../chibios
+* A copy of mavlink in ../mavlink (you will need to build the C message types)