diff --git a/ArduCopter/ReleaseNotes.txt b/ArduCopter/ReleaseNotes.txt
index 79868b3175..76193c7dbf 100644
--- a/ArduCopter/ReleaseNotes.txt
+++ b/ArduCopter/ReleaseNotes.txt
@@ -1,5 +1,12 @@
 ArduPilot Copter Release Notes:
 ------------------------------------------------------------------
+Copter 3.6.8-rc1 24-Apr-2019
+Changes from 3.6.7
+1) Safety fixes
+    a) Prevent loss of active IMU from causing loss of attitude control
+    b) Added startup check for Hex CubeBlack sensor failure
+    c) don't reset INS_ENABLE_MASK based on found IMUs
+------------------------------------------------------------------
 Copter 3.6.7 06-Mar-2019 / 3.6.7-rc1 28-Feb-2019
 Changes from 3.6.6
 1) Bug fixes and minor enhancements