diff --git a/reference/sem/reference.xml b/reference/sem/reference.xml
index d69b337c17..1b5020fa56 100644
--- a/reference/sem/reference.xml
+++ b/reference/sem/reference.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
  <reference id="ref.sem">
   <title>Semaphore, Shared Memory and IPC Functions</title>
   <titleabbrev>Semaphore</titleabbrev>
@@ -78,6 +78,8 @@
      <option role="configure">--enable-sysvsem</option>.
      To enable the System V shared memory support compile PHP with the option
      <option role="configure">--enable-sysvshm</option>.
+     To enable the System V messages support compile PHP with the option
+     <option role="configure">--enable-sysvmsg</option>.
     </para>
    </section>