diff --git a/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml b/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml
index 795cd6c1ea06dc40092dea2ab806decd4da8d2eb..dc38f1260d6b246ec580efc4e804dbe1e8079b64 100644
--- a/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml
+++ b/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml
@@ -478,7 +478,7 @@ Set to 2 to use heading from motion capture</short_desc>
     </parameter>
     <parameter default="56" name="TRIG_PINS" type="INT32">
       <short_desc>Camera trigger pin</short_desc>
-      <long_desc>Selects which pin is used, ranges from 1 to 6 (AUX1-AUX6 on px4_fmu-v2 and the rail pins on px4_fmu-v4). The PWM interface takes two pins per camera, while relay triggers on every pin individually. Example: Value 56 would trigger on pins 5 and 6. For GPIO mode Pin 6 will be triggered followed by 5. With a value of 65 pin 5 will be triggered followed by 6. Pins may be non contiguous. I.E. 16 or 61. In GPIO mode the delay pin to pin is &lt; .2 uS.</long_desc>
+      <long_desc>Selects which FMU pin is used (range: AUX1-AUX6 on Pixhawk controllers with an I/O board, MAIN1-MAIN6 on controllers without an I/O board. The PWM interface takes two pins per camera, while relay triggers on every pin individually. Example: Value 56 would trigger on pins 5 and 6. For GPIO mode Pin 6 will be triggered followed by 5. With a value of 65 pin 5 will be triggered followed by 6. Pins may be non contiguous. I.E. 16 or 61. In GPIO mode the delay pin to pin is &lt; .2 uS.</long_desc>
       <min>1</min>
       <max>123456</max>
       <decimal>0</decimal>