diff --git a/reference/math/functions/atan2.xml b/reference/math/functions/atan2.xml
index c843c7642a..09995ee7de 100644
--- a/reference/math/functions/atan2.xml
+++ b/reference/math/functions/atan2.xml
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.atan2">
    <refnamediv>
     <refname>atan2</refname>
-    <refpurpose>arc tangent of two variables</refpurpose>
+    <refpurpose>Arc tangent of two variables</refpurpose>
    </refnamediv>
    <refsect1>
     <title>Description</title>