diff --git a/ArduPlane/release-notes.txt b/ArduPlane/release-notes.txt
index 3f08765a55..7eecf34a39 100644
--- a/ArduPlane/release-notes.txt
+++ b/ArduPlane/release-notes.txt
@@ -1,3 +1,11 @@
+Release 3.9.9beta4, 31st July 2019
+----------------------------------
+
+Minor update over beta3:
+
+ - fixed an issue with handling baro failure on CubeBlack
+ - forced INS_USE3=1 on CubeBlack when first two IMUs are enabled
+
 Release 3.9.9beta3, 28th July 2019
 ----------------------------------