title: Perforce: Add description to the existing changelist
body: <p>I need to append some text to the description of already existing changelist in Perforce using Java.
  What would be the most efficient way to do it?</p>
  
  <p>I could think of </p>
  
  <pre><code>1. CL_content = p4 change -o &lt;changelist&gt; 
  2. Then append the required text to the description
  3. p4 change -i CL_content
  </code></pre>
  
  <p>But, it would not be suitable for very large changelists.</p>
  
  <p>Any other way?</p>