<p>In <a href="https://github.com/mlpack/mlpack/pull/723#discussion_r71064598">src/mlpack/core/util/cli_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -23,16 +23,19 @@ namespace mlpack {
&gt;   * @tparam T The type of the parameter.
&gt;   * @param identifier The name of the parameter, eg foo in bar/foo.
&gt;   * @param description A string description of the parameter.
&gt; - * @param parent The name of the parent of the parameter,
&gt; - *   eg bar/foo in bar/foo/buzz.
&gt; - * @param required If required, the program will refuse to run
&gt; - *   unless the parameter is specified.
&gt; + * @param parent The name of the parent of the parameter, e.g. bar/foo in
&gt; + *     bar/foo/buzz.
&gt; + * @param required If required, the program will refuse to run unless the
&gt; + *     parameter is specified.
&gt; + * @param input If true, the parameter is an input parameter (not an output
&gt; + *     parameter).
&gt;   */
&gt;  template&lt;typename T&gt;
&gt;  void CLI::Add(const std::string&amp; identifier,
&gt;                const std::string&amp; description,
&gt;                const std::string&amp; alias,
</pre>
<p>It's some inconsistency from the old code, but I think we should use <code>parent</code> here.</p>

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