From the 2014-06-20 version of Raspbian:
Code: Select all
deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi
To prevent this problem in future, rather than editing sources.list directly you can instead create a separate file in the /etc/apt/sources.list.d/ directory, and apt will magically treat it as though it was part of the main sources.list
Don't forget to be careful that Raspbian uses a very non-typical Debian setup (armhf on an ARMv6) so unless the repo you're adding explicitly has Raspbian support, it's unlikely to work on the Raspberry Pi.