including ERB in README.rdoc and rdoc pukes

I am building a very small gem and need to include some ERB in the
README.rdoc for this gem.

example:

Here is a couple of instructions, blah, blah...

  <div class="field">
    <%= f.label :author %><br />
    <%= f.text_field :author %>
  </div>
  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>

rdoc will not generate anything unless I remove the ERB or bastardize
it like removing a percent sign or something. I've seen ERB in
several open source project README files, so, I don't get it.

Anyone else run into this problem. Do I need to do something special
to add ERB into a non-source code file?