diff --git a/language/constants.xml b/language/constants.xml
index e0e9507e3b..c28d6a5801 100644
--- a/language/constants.xml
+++ b/language/constants.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.36 $ -->
+<!-- $Revision: 1.37 $ -->
  <chapter id="language.constants">
   <title>Constants</title>
 
@@ -26,17 +26,17 @@
 <?php
 
 // Valid constant names
-define("foo",     "something");
-define("foo2",    "something else");
-define("foo_bar", "something more")
+define("FOO",     "something");
+define("FOO2",    "something else");
+define("FOO_BAR", "something more")
 
 // Invalid constant names
-define("2foo",    "something");
+define("2FOO",    "something");
 
 // This is valid, but should be avoided:
 // PHP may one day provide a magical constant
 // that will break your script
-define("__foo__", "something"); 
+define("__FOO__", "something"); 
 
 ?>
 ]]>