diff --git a/language/constants.xml b/language/constants.xml
index dc7da1bbcb..f622ca90b3 100644
--- a/language/constants.xml
+++ b/language/constants.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.32 $ -->
+<!-- $Revision: 1.33 $ -->
  <chapter id="language.constants">
   <title>Constants</title>
 
@@ -66,10 +66,14 @@
    </note>
    <simpara>
     If you use an undefined constant, PHP assumes that you mean
-    the name of the constant itself. A 
-    <link linkend="ref.errorfunc">notice</link> will be issued
-    when this happens. Use the <function>defined</function>-function if 
-    you want to know if a constant is set.
+    the name of the constant itself, just as if you called it as
+    a <type>string</type> (CONSTANT vs "CONSTANT").  An error of level
+    <link linkend="ref.errorfunc">E_NOTICE</link> will be issued
+    when this happens.  See also the manual entry on why 
+    <link linkend="language.types.array.foo-bar">$foo[bar]</link> is
+    wrong (unless you first <function>define</function>
+    <literal>bar</literal> as a constant).  If you simply want to check if a
+    constant is set, use the <function>defined</function> function.
    </simpara>
    <para>
     These are the differences between constants and variables: