diff --git a/language/functions.xml b/language/functions.xml
index 5df10353a2..008d2900c5 100644
--- a/language/functions.xml
+++ b/language/functions.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.33 $ -->
+<!-- $Revision: 1.34 $ -->
  <chapter id="functions">
   <title>Functions</title>
 
@@ -113,6 +113,12 @@ bar();
     PHP does not support function overloading, nor is it possible to
     undefine or redefine previously-declared functions.
    </simpara>
+   <note>
+    <simpara>
+     Function names are case-insensitive, though it is usually good form
+     to call functions as they appear in their declaration.
+    </simpara>
+   </note>   
    <simpara>
     PHP 3 does not support variable numbers of arguments to functions,
     although default arguments are supported (see <link