diff --git a/ArduSub/ReleaseNotes.txt b/ArduSub/ReleaseNotes.txt
index eedd5bb4260f8a..1ad84236b4e73a 100644
--- a/ArduSub/ReleaseNotes.txt
+++ b/ArduSub/ReleaseNotes.txt
@@ -1,5 +1,10 @@
 APM:Sub Release Notes:
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Sub 3.4.1 04-May-2017
+
+Don't report battery percentage estimate. The estimate is only correct if battery
+is fully charged at boot. User should rely on voltage estimate.
+
 Sub 3.4 30-Dec-2016 / Sub 3.4-rc3 14-Dec-2016
 First Stable Release