diff --git a/language/control-structures.xml b/language/control-structures.xml
index c9b46c7e74..bac0f47efb 100644
--- a/language/control-structures.xml
+++ b/language/control-structures.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.144 $ -->
+<!-- $Revision: 1.145 $ -->
  <chapter xml:id="language.control-structures" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Control Structures</title>
 
@@ -1350,6 +1350,9 @@ echo "A $color $fruit"; // A green apple
      then all of the code contained in the called file will behave as
      though it had been defined inside that function.  So, it will follow
      the variable scope of that function.
+     An exception to this rule are <link
+     linkend="language.constants.predefined">magic constants</link> which are
+     evaluated by the parser before the include occurs.
    </simpara>
    <para>
      <example>