diff --git a/ArduCopter/ReleaseNotes.txt b/ArduCopter/ReleaseNotes.txt
index ad0fc0b24a..d75e11a9e6 100644
--- a/ArduCopter/ReleaseNotes.txt
+++ b/ArduCopter/ReleaseNotes.txt
@@ -1,5 +1,11 @@
 ArduPilot Copter Release Notes:
 ------------------------------------------------------------------
+Copter 4.0.5-rc2 08-Oct-2020
+Changes from 4.0.5-rc1
+1) Bug fixes:
+    a) Serial/UART DMA race condition that could cause watdog reset fixed (Critical fix)
+    b) SBUS output when no RC input fixed (Critical fix)
+------------------------------------------------------------------
 Copter 4.0.5-rc1 02-Oct-2020
 Changes from 4.0.4
 1) Bug fixes: