diff --git a/config/Syncthing.nix b/config/Syncthing.nix
index b0cb84be..131d7729 100644
--- a/config/Syncthing.nix
+++ b/config/Syncthing.nix
@@ -5,6 +5,7 @@
 }: let
 	cfg = config.module.syncthing;
 in {
+	# NOTE: Access at `http://localhost:8384`.
 	options.module.syncthing = {
 		enable = lib.mkEnableOption "the file sync.";
 		dataDir = lib.mkOption {