elixir-lang/elixir — pull request #2686 by billgathen (2014-08-16 13:03:55+00:00)
Title: Using autocomplete for function discovery

I had to go to the mailing list to discover this trick. Knowing it's autocomplete supplying the information makes it obvious in hindsight, but I had it in my head that it would be part of the h() command. It might also be worth adding a mention of autocomplete to the h(IEx) page, as well, but since this is likely first help page a new user would come across, this may be enough.