diff --git a/.gitmodules b/.gitmodules
index 0c18ae4..eb1a82c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -274,3 +274,7 @@
 [submodule "addons/luasql/module"]
 	path = addons/luasql/module
 	url = https://github.com/saspivey98/luasql-definitions
+[submodule "addons/ethos/module"]
+	path = addons/ethos/module
+	url = https://github.com/flyingeek/ethos-lua-definitions.git
+	branch = luals-addon
diff --git a/addons/ethos/info.json b/addons/ethos/info.json
new file mode 100644
index 0000000..e93cb55
--- /dev/null
+++ b/addons/ethos/info.json
@@ -0,0 +1,7 @@
+{
+  "$schema": "https://raw.githubusercontent.com/LuaLS/LLS-Addons/main/schemas/addon_info.schema.json",
+  "name": "Ethos Lua (FrSky)",
+  "description": "Definitions for the Ethos Lua API, used in FrSky transmitters.",
+  "size": 75430,
+  "hasPlugin": false
+}
diff --git a/addons/ethos/module b/addons/ethos/module
new file mode 160000
index 0000000..f859352
--- /dev/null
+++ b/addons/ethos/module
@@ -0,0 +1 @@
+Subproject commit f859352f59dd76f2f82524cf8bde5bee1e445273