Sorry about the lateness in my reply but i had to pass comment on this one,
Chances are you have done no damage due to the small amount you could feasibly 'pour' into the dipstick tube. Must have been a long slow process, how much did you actually manage to get in?
However to contest what Kjn2 said about warning lights etc, You do have to regulary check and top up your oil level, even the most modern of cars consume some oil as a matter of course, also todays oils have a shelf life when in use and require changing after a specific period depending on vehicle manufacturer due to contaminates produced by the 'working' engine.
Check your oil level using the dipstick, normally the difference from low level to max level is only around 1 litre or so, If your only just above the max level then i wouldn't worry about it, if it is quite a lot above the max mark then i would recommend you get an oil and filter change done at your local fast fit centre(cheapest and most convenient) this will ensure you've done the proper thing for the long term 'health' of your cars engine.....
Warning lights on a car more often than not only come on once the damage has been done, not before it. What ever you do keep a regular eye on the dipstick level and not on the warning lights. If anything preventative maintenance is better than waiting until something starts flashing warning signs at you...
Happy Motoring