Getting documentation programmatically?

Thanks, that looks like what I need. I tried calling it by hand, but I get an error instead:

iex(10)> IEx.Introspection.h(:Kernel)
Could not load module :Kernel, got: nofile
iex(11)> Code.ensure_loaded(:Kernel)
{:error, :nofile}

I looked up the definition of h, but it uses macros, which I am not yet familiar with.