Correct vm option syntax.
diff --git a/org.jacoco.doc/docroot/doc/faq.html b/org.jacoco.doc/docroot/doc/faq.html
index c37c265..643a8d3 100644
--- a/org.jacoco.doc/docroot/doc/faq.html
+++ b/org.jacoco.doc/docroot/doc/faq.html
@@ -117,7 +117,7 @@
 <h3>Does JaCoCo run on the IBM JRE J9 and WebSphere?</h3>
 <p>
   It does. To make the JaCoCo agent work please set the VM option
-  <code>-shareclassed:none</code>.
+  <code>-Xshareclassed:none</code>.
 </p>
 
 </div>