diff --git a/ArduCopter/ReleaseNotes.txt b/ArduCopter/ReleaseNotes.txt
index 4583498b49..0416190a12 100644
--- a/ArduCopter/ReleaseNotes.txt
+++ b/ArduCopter/ReleaseNotes.txt
@@ -1,5 +1,16 @@
 ArduPilot Copter Release Notes:
 ------------------------------------------------------------------
+Copter 3.6.4-rc1 20-Dec-2018
+Changes from 3.6.3
+1) Bug fixes and minor enhancements
+    a) Detect and clear stuck I2C bus when using ChibiOS
+    b) Pixhawk4 fix for battery monitor voltage scaling
+    c) TradHeli Dual (aka Chinook) fix for scaling of second swashplate movement
+    d) Omnibus F7 IMU orientation fix
+    e) Gimbal fix to avoid extreme movement if pilot's transmitter is off at startup 
+    f) Follow mode fix to obey FOLL_SYSID parameter (controls which vehicle to follow)
+2) Cheerson CX-OF optical flow sensor support
+------------------------------------------------------------------
 Copter 3.6.3 04-Dec-2018 / 3.6.3-rc1 01-Dec-2018
 Changes from 3.6.2
 1) Bug fixes and minor enhancements