diff --git a/Readme.md b/Readme.md
index 0e7654f95..bf4667c51 100644
--- a/Readme.md
+++ b/Readme.md
@@ -5,7 +5,7 @@ For Ubuntu:
 
 "librtlsdr-dev" is in the "universe" repo. (utopic 14.10 amd64.)
 
-Use "cmake ../ -DKERNEL=ON" to build the Linux kernel driver (Experimental). Needs a recent kernel and libv4l2. Will need extra work to support Airspy and Hackrf.
+Use "cmake ../ -DKERNEL=ON" to build the Linux kernel driver (Experimental). Needs a recent kernel and libv4l2. Will need extra work to support Airspy and Hackrf. Needs "cp KERNEL_SOURCE/include/linux/compiler.h /usr/include/linux/" and "cp KERNEL_SOURCE/include/uapi/linux/videodev2.h /usr/include/uapi/linux/" and package "libv4l-dev".
 
 The Gnuradio plugin source needs extra packages, including "liblog4cpp-dev libboost-system-dev gnuradio-dev libosmosdr-dev"