diff --git a/message_definitions/v1.0/common.xml b/message_definitions/v1.0/common.xml
index ff44c7ea44..cfbcc56e45 100644
--- a/message_definitions/v1.0/common.xml
+++ b/message_definitions/v1.0/common.xml
@@ -4437,7 +4437,7 @@
       <field type="int32_t" name="lat" units="degE7">Latitude, expressed</field>
       <field type="int32_t" name="lon" units="degE7">Longitude, expressed</field>
       <field type="int32_t" name="alt" units="mm">Altitude (MSL). Note that virtually all GPS modules provide both WGS84 and MSL.</field>
-      <field type="int32_t" name="relative_alt" units="mm">Altitude above ground</field>
+      <field type="int32_t" name="relative_alt" units="mm">Altitude above home</field>
       <field type="int16_t" name="vx" units="cm/s">Ground X Speed (Latitude, positive north)</field>
       <field type="int16_t" name="vy" units="cm/s">Ground Y Speed (Longitude, positive east)</field>
       <field type="int16_t" name="vz" units="cm/s">Ground Z Speed (Altitude, positive down)</field>