diff --git a/functions/math.xml b/functions/math.xml
index 16ceccfee6..e4aed63c0f 100644
--- a/functions/math.xml
+++ b/functions/math.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.72 $ -->
+<!-- $Revision: 1.73 $ -->
  <reference id="ref.math">
   <title>Mathematical Functions</title>
   <titleabbrev>Math</titleabbrev>
@@ -760,12 +760,10 @@ var_dump(hexdec("a0"));
       <type>bool</type><methodname>is_nan</methodname>
       <methodparam><type>float</type><parameter>val</parameter></methodparam>
      </methodsynopsis>
-    <para>
     <para>
      Returns &true; if <parameter>val</parameter> is 'not a number', 
      like the result of <literal>acos(1.01)</literal>.
     </para>
-    </para>
    </refsect1>
   </refentry>