Need help in ubuntu plz!

E:Malformed line 3 in source list/etc/apt/sources.list.d/steam.list (dist parse)

This occured after I attempted to install the packages for steam which were prompted . I tried sudo gedit /etc/apt/

sources.list but I don't know what to do after that HELP ME!! ( Ubuntu 12.04 LTS)

How do I fix it

cf other identical thread, maybe a mod would be so kind to remove the superfluous one?