Help with Team Fortress 2 Arena Map

I’m making a map for Arena…i’m looking at http://developer.valvesoftware.com/wiki/TF2/Making_an_Arena_map

It tells me to make a tf_logic_arena entity but it’s not there…then it tells me to open the .vmf in notepad and search for, “tf_logic_arena” and its not there…it also tells me to add a code above “origin” it tells me to put in a code. The other method just confuses me…

Could anyone please tell me how to add a tf_logic_arena to my map? thanks!

Use Boojum’s Entity Library. You can find it on www.tf2maps.net under Downloads, and you can just copy it from his.