diff --git a/config.lua b/config.lua
new file mode 100644
index 0000000..1feb67d
--- /dev/null
+++ b/config.lua
@@ -0,0 +1,41 @@
+config = {
+
+    -- The user one expects to log in as
+    user = "@alice:example.org",
+
+    -- The URL where the user communicates with the Matrix homeserver
+    url = "https://matrix.example.org",
+
+    -- Room ID that the Minetest server bridges to
+    room_id = "!room_id:example.org",
+
+    -- Access token to access the Matrix homeserver
+    access_token = "",
+
+    -- Average timeout duration
+    sync_timeout = 30
+}
+
+local function verify(key, expected_type, default_value)
+    if config == nil then
+        error("There is no config variable available!")
+    elseif config[key] == nil then
+        error("Config key " .. key .. " has not been set!")
+    elseif type(config[key]) ~= expected_type then
+        error(
+            "Expected config key " .. key .. " to be of type " ..
+            expected_type .. " but found type " .. type(config[key])
+        )
+    elseif config[key] == default_value then
+        error(
+            "Config key " .. key .. " is still the default (example) value. " ..
+            "This implies that you have not configured it yet."
+        )
+    end
+end
+
+verify("user", "string", "@alice:example.org")
+verify("url", "string", "https://matrix.example.org")
+verify("room_id", "string", "!room_id:example.org")
+verify("access_token", "string", "")
+verify("sync_timeout", "number", nil)