diff --git a/demo.html b/demo.html
index 808e314..b24ba18 100644
--- a/demo.html
+++ b/demo.html
@@ -96,6 +96,9 @@
 					<p>
 						Hold down the <strong>alt</strong> key (<strong>ctrl</strong> in Linux) and click on any element to zoom towards it using <a href="http://lab.hakim.se/zoom-js">zoom.js</a>. Click again to zoom back out.
 					</p>
+					<p>
+						(NOTE: Use ctrl + click in Linux.)
+					</p>
 				</section>
 
 				<section>