man page: long and short opts

Hi

In a man page I have:

<refentry>
  <!-- ... -->
  <refsect1>
    <title>Options</title>
    <variablelist>
      <!-- ... -->
      <varlistentry>
        <term><option>--prompt</option> <replaceable>string</replaceable></term>
        <listitem>
          <simpara>Use <replaceable>string</replaceable> as prompt in
          command mode.</simpara>
        </listitem>
      </varlistentry>

--prompt can also be supplied as -p; how would I best mark this up?

Any other suggestions?

TIA,
Tobi

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