diff --git a/appendices/reserved.xml b/appendices/reserved.xml
index f26b2e7447..8034fc4544 100755
--- a/appendices/reserved.xml
+++ b/appendices/reserved.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.20 $ -->
+<!-- $Revision: 1.21 $ -->
 
  <appendix id="reserved">
   <title>List of Reserved Words</title>
@@ -237,8 +237,10 @@
     </simpara>
 
     <simpara>
-     <varname>$HTTP_SERVER_VARS</varname> contains the same
-     information, but is not an autoglobal. 
+     <varname>$HTTP_SERVER_VARS</varname> contains the same initial
+     information, but is not an autoglobal. (Note that
+     <varname>HTTP_SERVER_VARS</varname> and <varname>$_SERVER</varname>
+     are different variables and that PHP handles them as such)
     </simpara>
 
     <simpara>
@@ -592,8 +594,10 @@
     </simpara>
 
     <simpara>
-     <varname>$HTTP_ENV_VARS</varname> contains the same
-     information, but is not an autoglobal. 
+     <varname>$HTTP_ENV_VARS</varname> contains the same initial
+     information, but is not an autoglobal. (Note that
+     <varname>HTTP_ENV_VARS</varname> and <varname>$_ENV</varname>
+     are different variables and that PHP handles them as such)
     </simpara>
 
     <simpara>
@@ -632,8 +636,10 @@
     </simpara>
 
     <simpara>
-     <varname>$HTTP_COOKIE_VARS</varname> contains the same
-     information, but is not an autoglobal. 
+     <varname>$HTTP_COOKIE_VARS</varname> contains the same initial
+     information, but is not an autoglobal. (Note that
+     <varname>HTTP_COOKIE_VARS</varname> and <varname>$_COOKIE</varname>
+     are different variables and that PHP handles them as such)
     </simpara>
 
     <simpara>
@@ -672,8 +678,10 @@
     </simpara>
 
     <simpara>
-     <varname>$HTTP_GET_VARS</varname> contains the same
-     information, but is not an autoglobal. 
+     <varname>$HTTP_GET_VARS</varname> contains the same initial
+     information, but is not an autoglobal. (Note that
+     <varname>HTTP_GET_VARS</varname> and <varname>$_GET</varname>
+     are different variables and that PHP handles them as such)
     </simpara>
 
     <simpara>
@@ -712,8 +720,10 @@
     </simpara>
 
     <simpara>
-     <varname>$HTTP_POST_VARS</varname> contains the same
-     information, but is not an autoglobal. 
+     <varname>$HTTP_POST_VARS</varname> contains the same initial
+     information, but is not an autoglobal. (Note that
+     <varname>HTTP_POST_VARS</varname> and <varname>$_POST</varname>
+     are different variables and that PHP handles them as such)
     </simpara>
 
     <simpara>