diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..4ad2b01
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,21 @@
+if not minetest.is_singleplayer() then
+	error("Main menu changes work only in singleplayer mode.")
+end
+
+local current_main_menu_path = minetest.settings:get("main_menu_path")
+local main_menu_path = minetest.get_modpath("mainmenu_csm") .. '/builtin/mainmenu'
+if current_main_menu_path ~= main_menu_path then
+	minetest.register_on_joinplayer(
+		function()
+			minetest.settings:set("main_menu_path", main_menu_path)
+			minetest.kick_player(
+				"singleplayer",
+				[[
+CSM tab added to main menu.
+
+Reconnect to play the game.
+]]
+			)
+		end
+	)
+end
diff --git a/mod.conf b/mod.conf
new file mode 100644
index 0000000..ed07ad9
--- /dev/null
+++ b/mod.conf
@@ -0,0 +1,2 @@
+name = mainmenu_csm
+description = Adds a client-side mod (CSM) tab to the main menu