diff --git a/x52d.html b/x52d.html
index 9326fad..b2d003a 100644
--- a/x52d.html
+++ b/x52d.html
@@ -82,6 +82,7 @@ Command line arguments</h1>
 <li><code>-q</code> - Reduce logging verbosity to minimum (default: no)</li>
 <li><code>-l</code> - Path to log file</li>
 <li><code>-c</code> - Path to configuration file</li>
+<li><code>-p</code> - Path to PID file</li>
 <li><code>-o</code> - Configuration override - only applied during startup</li>
 </ul>
 <h1><a class="anchor" id="autotoc_md8"></a>