diff --git a/libraries/AP_Scripting/modules/MAVLink/Readme.md b/libraries/AP_Scripting/modules/MAVLink/Readme.md
index 97924a1c33a07..24db0379b2d9e 100644
--- a/libraries/AP_Scripting/modules/MAVLink/Readme.md
+++ b/libraries/AP_Scripting/modules/MAVLink/Readme.md
@@ -3,4 +3,6 @@ These .lua definition for messages can be generated using pymavlink with the fol
 ```
 cd ardupilot/modules/mavlink
 python ./pymavlink/tools/mavgen.py --lang Lua ./message_definitions/v1.0/all.xml --out ./modules/MAVLink
-```
\ No newline at end of file
+```
+
+Add `--wire-protocol 2.0` to include extension fields in the generated code