diff --git a/ArduCopter/ReleaseNotes.txt b/ArduCopter/ReleaseNotes.txt
index 6571b79be1..0633c23509 100644
--- a/ArduCopter/ReleaseNotes.txt
+++ b/ArduCopter/ReleaseNotes.txt
@@ -1,6 +1,6 @@
 ArduPilot Copter Release Notes:
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-Copter 4.0.6-rc1 21-Dec-2020
+Copter 4.0.6-rc1 23-Dec-2020
 Changes from 4.0.5
 1) Bug fixes:
     a) Fix vertical flyaways when rangefinder stops providing data and the user has configured EK*_ALT_SOURCE=1
@@ -9,10 +9,16 @@ Changes from 4.0.5
     d) Correct compilation when Advanced Failsafe compile time option is enabled
     e) Correct time wrap in RAW_IMU mavlink message
     f) PixracerPro - Fix analog volt pin assignments
+    g) fix landing detector for tradheli in acro mode
 2) Small enhancements:
     a) Parameter documentation enhancements and corrections
     b) Improve harmonic notch filter parameter documentation
     c) Report prearm check status in the MAV_SYS_STATUS_PREARM_CHECK flag of the SYS_STATUS mavlink message
+    d) Smooth I term reset over 0.5 seconds
+3) TradHeli enhancements:
+    a) Differential Collective Pitch (DCP) trim support for Dual Heli
+    b) Incorporate hover collective learning
+    c) Option for pitch, roll and yaw I term to be based on takeoff/landing
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 Copter 4.0.5 27-Oct-2020 / 4.0.5-rc2 08-Oct-2020
 Changes from 4.0.5-rc1