emphasis h2olog is experimental
<p>h2olog is a an experimental <a href="https://www.kernel.org/doc/html/latest/bpf/index.html">BPF</a> (<a href="https://www.kernel.org/doc/Documentation/networking/filter.txt">kernel doc</a>) backed tracing tool for the <a href="https://github.com/h2o/h2o">H2O</a> server.
It can be used for tracing HTTP-level or QUIC-level events.</p>
+<p><em>Since this is experimental, its command-line interface might change without notice.</em></p>
+
<h2 id="installing-from-source">Installing from Source</h2>
<p>See <a href="#requirements">requirements</a> for build prerequisites.</p>
