diff --git a/.gitmodules b/.gitmodules
index 04e6e6a..2e7aade 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -177,3 +177,6 @@
 [submodule "addons/RavenscriptIDEA_withRavenM/module"]
 	path = addons/RavenscriptIDEA_withRavenM/module
 	url = https://github.com/RavenfieldCommunity/ravenscriptidea
+[submodule "addons/fenster/module"]
+	path = addons/fenster/module
+	url = https://github.com/jonasgeiler/lua-fenster-type-definitions.git
diff --git a/addons/fenster/info.json b/addons/fenster/info.json
new file mode 100644
index 0000000..3fcff4f
--- /dev/null
+++ b/addons/fenster/info.json
@@ -0,0 +1,5 @@
+{
+  "$schema": "https://raw.githubusercontent.com/LuaLS/LLS-Addons/main/schemas/addon_info.schema.json",
+  "name": "lua-fenster",
+  "description": "Definitions for the lua-fenster library."
+}
diff --git a/addons/fenster/module b/addons/fenster/module
new file mode 160000
index 0000000..5a7e9cd
--- /dev/null
+++ b/addons/fenster/module
@@ -0,0 +1 @@
+Subproject commit 5a7e9cd25954df5d858cc6d97e6afd1d7378574c