CategoryMain documentation page doesn't specify the header name

[prophile]

The CategoryMain page of the wiki says:

Redefine main() if necessary so that it is called by SDL.

and

This is a "single-header library," which is to say that including this header inserts code into your program, and you should only include it once in most cases. SDL.h does not include this header automatically.

Presumably this is documenting a single header which needs to be included separately, but nowhere on the page does it specify what this header actually is.