How to set entity on fire?

I am making something that requires player entities to be set on fire, but there is nothing on the gmod wiki besides entity:IsOnFire(), and all that does is return if the entity is on fire! I’d think it’d be rather easy to find out how to do this, but I’ve been proven wrong by my searches.

[editline]3rd May 2015[/editline]

I’m pretty sure in TTT, there is a function StartFires() that does what I am asking.

Nevermind! Looks like that requires an explosion? I am back to square one.