diff --git a/libraries/AP_NavEKF2/AP_NavEKF2.cpp b/libraries/AP_NavEKF2/AP_NavEKF2.cpp
index bb583b294f..147c54621f 100644
--- a/libraries/AP_NavEKF2/AP_NavEKF2.cpp
+++ b/libraries/AP_NavEKF2/AP_NavEKF2.cpp
@@ -10,8 +10,7 @@
 /*
   parameter defaults for different types of vehicle. The
   APM_BUILD_DIRECTORY is taken from the main vehicle directory name
-  where the code is built. Note that this trick won't work for arduino
-  builds on APM2, but NavEKF2 doesn't run on APM2, so that's OK
+  where the code is built.
  */
 #if APM_BUILD_TYPE(APM_BUILD_ArduCopter)
 // copter defaults