Add Java requirements

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@@ -616,6 +616,10 @@ <h2 id="introduction"><a class="anchor" href="#introduction"></a>Introduction</h
 <div class="sect1">
 <h2 id="installation"><a class="anchor" href="#installation"></a>Installation</h2>
 <div class="sectionbody">
+<div class="paragraph">
+<p>PerfTest requires at least Java 8, but <a href="#instance-synchronization">some features</a> require Java 11.
+The latest LTS Java version is recommended.</p>
+</div>
 <div class="sect2">
 <h3 id="from-binary"><a class="anchor" href="#from-binary"></a>From Binary</h3>
 <div class="paragraph">
@@ -2136,7 +2140,7 @@ <h3 id="expected-and-exposed-metrics"><a class="anchor" href="#expected-and-expo
 <div id="footer">
 <div id="footer-text">
 Version 2.22.0-SNAPSHOT<br>
-Last updated 2024-08-07 13:32:02 UTC
+Last updated 2024-08-07 13:42:07 UTC
 </div>
 </div>
 </body>