diff --git a/functions/session.xml b/functions/session.xml
index c737742463..9b5e8230e9 100644
--- a/functions/session.xml
+++ b/functions/session.xml
@@ -274,12 +274,10 @@ close
      </listitem>
      <listitem>
       <simpara>
-       <literal>session.referer_check</literal> determines whether
-       session ids referred to by external sites will be
-       eliminated. If session ids are propagated using the URL method,
-       users not knowing about the impact might publish session
-       ids. This can lead to security problems which this check tries
-       to defeat. Defaults to <literal>0</literal>.
+       <literal>session.referer_check</literal> contains the substring you
+       want to check each HTTP Referer for. If the Referer was sent by the
+       client and the substring was not found, an embedded session id will 
+       be marked as invalidate. Defaults to the empty string.
       </simpara>
      </listitem>
      <listitem>