diff --git a/language/operators.xml b/language/operators.xml
index b51af9865d..dc699cd630 100644
--- a/language/operators.xml
+++ b/language/operators.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.60 $ -->
+<!-- $Revision: 1.61 $ -->
  <chapter id="language.operators">
   <title>Operators</title>
   <simpara>
@@ -814,8 +814,12 @@ $a .= "World!";     // now $a contains "Hello World!"
 $a = array("a" => "apple", "b" => "banana");
 $b = array("a" => "pear", "b" => "strawberry", "c" => "cherry");
 
-$c = $a + $b;
+$c = $a + $b; // Union of $a and $b
+echo "Union of \$a and \$b: \n";
+var_dump($c);
 
+$c = $b + $a; // Union of $b and $a
+echo "Union of \$b and \$a: \n";
 var_dump($c);
 ?>
 ]]>
@@ -824,6 +828,7 @@ var_dump($c);
     When executed, this script will print the following:
     <screen role="php">
 <![CDATA[
+Union of $a and $b:
 array(3) {
   ["a"]=>
   string(5) "apple"
@@ -832,7 +837,15 @@ array(3) {
   ["c"]=>
   string(6) "cherry"
 }
-
+Union of $b and $a:
+array(3) {
+  ["a"]=>
+  string(4) "pear"
+  ["b"]=>
+  string(10) "strawberry"
+  ["c"]=>
+  string(6) "cherry"
+}
 ]]>
     </screen>
    </para>