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+= Release Notes for Version 1.8.1
+:toc!:
+:doctype: article
+
+	Version 1.8.1 includes an important bug fix for Apogee Lockout
+	operation in all flight computers. Anyone using this option
+	must update firmware.
+
+	This release also contains a change in how flight computers
+	with accelerometers deal with speeds around and above Mach
+	1. In previous versions, the flight computer would completely
+	disregard the barometric sensor above 330m/s (around Mach
+	1). Now, the data from the barometric sensor is reduced in
+	effect without ever going away entirely. This prevents early
+	drogue deployment for flights which spend considerable time
+	above Mach 1.
+
+	1.8.1 also contains a couple of minor fixes for AltosUI when
+	analyzing saved data files.
+
+	== AltOS
+
+	AltOS Bug Fixes
+
+	* Handle time value wrapping in Apogee Lockout
+          correctly. Without this, apogee lockout would sometimes
+          prevent any drogue charge from firing.
+
+	* Change Kalman filter on flight computers with accelerometer
+          to continue using the barometric sensor even at high speeds
+          to avoid unintentional drogue deployment during
+          deceleration.
+
+	== AltosUI and TeleGPS Applications
+
+	AltosUI New Features
+
+	* Add new 'Huge' font size to make text even bigger on high
+          resolution monitors.
+
+	AltosUI Bug Fixes
+
+	* Prevent some crashes when reading older saved flight data
+          for graphing or KML export.
+
+	* Load frequency preference at startup. The loading code was
+          broken, so you'd see only the default frequencies.