update README

README

@@ -20,3 +20,11 @@ Run make:
 	(user)$ make
 Install:
 	(root)# make install
+
++ Tips
+
+To sync passwords between devices, set up a Git repository and run a cron job to
+occasionally sync devices to it.
+
+(!) WARNING - Ensure this repository is visible to ONLY YOU. The best way to ensure
+this is to host your own Git server on your network.