diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..338c30b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+config.lua
diff --git a/README.md b/README.md
index 67f9e4b..9d7eb35 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,29 @@
 # Minetest Matrix bridge
 
+This is a server-side mod for Minetest, creating a bridge between a Matrix instant-messaging room and a Minetest server.
+
+**Early development**, do not use it in production yet.
+
+This mod does not use any additional lua library, only standard Minetest API.
+
+## Install
+
+The mod needs an existing account on the Matrix server, and access to the room.
+
+Copy the template config to `config.lua`:
+
+```bash
+cp config.template.lua config.lua
+```
+
+then edit `config.lua`.
+
+Add `matrix_bridge` to `secure.http_mods` (e.g. in the file `/etc/minetest/minetest.conf`):
+
+```
+secure.http_mods = matrix_bridge
+```
+
 ## Contributing
 
 See [Matrix API docs](https://www.matrix.org/docs/guides/client-server-api).
diff --git a/config.template.lua b/config.template.lua
new file mode 100644
index 0000000..449359e
--- /dev/null
+++ b/config.template.lua
@@ -0,0 +1,8 @@
+-- Rename `config.template.lua` to `config.lua`
+-- Please edit only `config.lua`.
+-- `config.lua` will not be overwritten by updates.
+
+MATRIX_SERVER = "https://matrix.txmn.tk:8448"
+MATRIX_ROOM = "!xReNhJbGJeGK4fysJU:matrix.txmn.tk"
+MATRIX_USERNAME = "minebot"
+MATRIX_PASSWORD = "PUT-YOUR-PASSWORD-HERE"
diff --git a/init.lua b/init.lua
index 1524801..23e37ce 100644
--- a/init.lua
+++ b/init.lua
@@ -1,5 +1,6 @@
 local modpath = minetest.get_modpath(minetest.get_current_modname())
 
+dofile(modpath.."/config.lua")
 dofile(modpath.."/debug.lua")
 
 local http = minetest.request_http_api()
@@ -13,7 +14,7 @@ local txid = 0
 function send_message(msg)
 	txid = txid + 1
 	http.fetch({
-		url = "https://matrix.txmn.tk:8448/_matrix/client/r0/rooms/!xReNhJbGJeGK4fysJU:matrix.txmn.tk/send/m.room.message/"..txid.."?access_token="..token,
+		url = MATRIX_SERVER.."/_matrix/client/r0/rooms/"..MATRIX_ROOM.."/send/m.room.message/"..txid.."?access_token="..token,
 		method = "PUT",
 		extra_headers = {"Content-Type: application/json"},
 		data = minetest.write_json({msgtype="m.text", body=msg})
@@ -22,10 +23,10 @@ function send_message(msg)
 end
 
 http.fetch({
-	url = "https://matrix.txmn.tk:8448/_matrix/client/r0/login",
+	url = MATRIX_SERVER.."/_matrix/client/r0/login",
 	method = "POST",
 	extra_headers = {"Content-Type: application/json"},
-	data = '{"type":"m.login.password","password":"PUT-PASSWORD-HERE","identifier":{"type":"m.id.user","user":"minebot"}}'
+	data = '{"type":"m.login.password","password":"'..MATRIX_PASSWORD..'","identifier":{"type":"m.id.user","user":"'..MATRIX_USERNAME..'"}}'
 }, function(res)
 	if res.code == 200 then
 		minetest.log("action", res.data)