clarify SSU want reply bit

i2p2www/pages/site/docs/spec/ssu.html

 {% extends "global/layout.html" %}
 {% block title %}SSU Protocol Specification{% endblock %}
-{% block lastupdated %}April 2014{% endblock %}
-{% block accuratefor %}0.9.12{% endblock %}
+{% block lastupdated %}July 2014{% endblock %}
+{% block accuratefor %}0.9.14{% endblock %}
 {% block content %}
 
 <p>
@@ -849,7 +849,8 @@ If the number of fragments is zero, this is an ack-only or keepalive message.
 </li><li>
 The ECN feature is unimplemented, and the bit is never set.
 </li><li>
-The want reply bit is always set in the current implementation.
+In the current implementation, the want reply bit is set when the number of
+fragments is greater then zero, and not set when there are no fragments.
 </li><li>
 Extended data is unimplemented and never present.
 </li><li>