Add warning above download

index.html

@@ -171,6 +171,10 @@
 				</button>
 			</div>
 
+			<div class="center">
+				<p>*Note that these QR codes may not work with every QR code reader, so be sure to test them first.  If you are having trouble getting them to read, you may want to increase the bit size.</p>
+			</div>
+
 			<br />
 		</div>