diff --git a/libraries/AP_Baro/AP_Baro.cpp b/libraries/AP_Baro/AP_Baro.cpp
index 69ac3638d4..da8d68d645 100644
--- a/libraries/AP_Baro/AP_Baro.cpp
+++ b/libraries/AP_Baro/AP_Baro.cpp
@@ -123,7 +123,7 @@ const AP_Param::GroupInfo AP_Baro::var_info[] = {
     // @Param: _EXT_BUS
     // @DisplayName: External baro bus
     // @Description: This selects the bus number for looking for an I2C barometer. When set to -1 it will probe all external i2c buses based on the GND_PROBE_EXT parameter.
-    // @Values: -1:Disabled,0:Bus0,1:Bus1
+    // @Values: -1:Disabled,0:Bus0,1:Bus1,6:Bus6
     // @User: Advanced
     AP_GROUPINFO("_EXT_BUS", 7, AP_Baro, _ext_bus, HAL_BARO_EXTERNAL_BUS_DEFAULT),