diff --git a/ArduPlane/release-notes.txt b/ArduPlane/release-notes.txt
index 983219b543..afb80e71b5 100644
--- a/ArduPlane/release-notes.txt
+++ b/ArduPlane/release-notes.txt
@@ -1,3 +1,20 @@
+Release 3.9.0beta5, 19th July 2018
+----------------------------------
+
+This is the fifth in a series of beta releases for plane 3.9.0. It
+fixes two important bugs over 3.9.0beta4
+
+ - fixed RC failsafe on IOMCU when a SBUS receiver is set to "hold" mode
+ - allowed for RC override failsafe to support holding override value
+   on timeout
+
+Thanks to Jon and Michael for the failsafe fixes!
+
+It also includes two smaller changes:
+
+ - updated F4BY board id, and added F4BY to autobuild list
+ - fixed UARTD for px4-v1 build
+
 Release 3.9.0beta4, 18th July 2018
 ----------------------------------