+<p class="sidebar"><b>Note:</b> Macs don't (yet?) support Secure Boot, but
+as of version 10.11 ("El Capitan"), OS X uses its own new security feature,
+<i>System Integrity Protection (SIP),</i> which creates its own set of
+hoops through which rEFInd users must jump. See the <a
+href="sip.html">rEFInd and System Integrity Protection</a> page for
+details.</p>
+