diff --git a/doc/glossary/glossary-terms.xml b/doc/glossary/glossary-terms.xml
index ba0de51f..75aa92e8 100644
--- a/doc/glossary/glossary-terms.xml
+++ b/doc/glossary/glossary-terms.xml
@@ -7215,18 +7215,6 @@
         instance can send and receive.</para>
       </glossdef>
     </glossentry>
-
-    <glossentry>
-      <glossterm>Ryu neutron plug-in</glossterm>
-      <indexterm class="singular">
-          <primary>Ryu neutron plug-in</primary>
-        </indexterm>
-
-      <glossdef>
-        <para>Enables the Ryu network operating system to function as a
-        Networking OpenFlow controller.</para>
-      </glossdef>
-    </glossentry>
   </glossdiv>
 
   <!-- .S. -->