diff --git a/libraries/ChibiOS_AVR/src/utility/chthreads.c b/libraries/ChibiOS_AVR/src/utility/chthreads.c
index aec1248..ae0d955 100644
--- a/libraries/ChibiOS_AVR/src/utility/chthreads.c
+++ b/libraries/ChibiOS_AVR/src/utility/chthreads.c
@@ -394,6 +394,7 @@ void chThdYield(void) {
  *
  * @api
  */
+void chThdExit(msg_t msg) attribute((used));  
 void chThdExit(msg_t msg) {
 
   chSysLock();
diff --git a/readme.txt b/readme.txt
index f720aca..10ab83e 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,4 +1,10 @@
-This is a port of ChibiOS/RT version 3.0.3 for Arduino.
+Please try the newer version of ChibiOS/RT in the ChRt repository.
+
+It is version 6.0.3 of the ChibiOS/RT kernel from release 
+19.1.3 of ChibiOS.
+
+This is a port of ChibiOS/RT version 3.0.3 for Arduino and will
+not be updated.
 
 AVR, Due, and Teensy 3.x boards are supported.