diff --git a/functions/math.xml b/functions/math.xml
index c00debf012..22db4fccbb 100644
--- a/functions/math.xml
+++ b/functions/math.xml
@@ -1,4 +1,4 @@
-<!-- $Revision: 1.41 $ -->
+<!-- $Revision: 1.42 $ -->
  <reference id="ref.math">
   <title>Mathematical Functions</title>
   <titleabbrev>Math</titleabbrev>
@@ -714,7 +714,7 @@ var_dump(hexdec("a0"));
        <parameter><optional>min</optional></parameter>
       </paramdef>
       <paramdef>int
-       <parameter>max</parameter>
+       <parameter><optional>max</optional></parameter>
       </paramdef>
      </funcprototype>
     </funcsynopsis>