SDL_SetError return value

In the wiki SDL_SetError returns void:

void SDL_SetError(const char* fmt, …)

however in the header file it’s int:

extern DECLSPEC int SDLCALL SDL_SetError(const char *fmt, …);

Seems like it returns -1 upon success and 0 if failed, right?

Oops, I missed the comment which says /* SDL_SetError() unconditionally returns -1. */, kinda confusing.