diff --git a/content/index.html b/content/index.html
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@@ -7,6 +7,17 @@
 			Agreement</a> unless otherwise specified.
 	</p>
 
+	<div class="messagebox" style="background-color: #def3fe; border: 1px solid #c5d7e0; color: black; padding: 5px; margin: 1ex 0; min-height: 35px; padding-left: 45px;">
+		<div style="float: left; margin-left: -40px;"><a href="/File:Note.png" class="image"><img alt="Note.png" src="/images/c/cc/Note.png" width="35" height="35" /></a></div>
+			<div>
+				<b>Prerequisites</b><br />
+				
+				You need to install Java 8 (64 bits). You can obtain it <a rel="nofollow" class="external text" href="http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html">here</a>.
+Note that Papyrus-RT <b>will not</b> work with Java 9 or with a 32-bit version of Java 8, or Java 7 and below.
+			</div>
+		</div>
+	</div>
+
 	<h2>There are four ways to install Eclipse Papyrus for Real Time
 		(Papyrus-RT):</h2>