diff --git a/atben/misc/atben-spi-performance.txt b/atben/misc/atben-spi-performance.txt
index a8dfd8b..d7756e8 100644
--- a/atben/misc/atben-spi-performance.txt
+++ b/atben/misc/atben-spi-performance.txt
@@ -4,6 +4,13 @@ Performance analysis of SPI drivers for ATBEN
 This was originally posted on April 10 2013 to the linux-zigbee and
 the qi-hardware list. The URLs have been updated for stability.
 
+Note that the code referenced in this analysis is meant to illustrate
+the general concepts. Some variants have been dropped since and the
+ones still in existence have been cleaned up and debugged in
+preparation for upstream submission. The current versions can be
+found in https://github.com/wpwrak/ben-wpan-linux
+
+
 What this is all about
 ----------------------
 
@@ -166,8 +173,3 @@ References
 ----------
 
 [1] http://www.jennic.com/files/support_files/JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
-
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