diff --git a/language/types.xml b/language/types.xml
index b3725222bf..78eab06df0 100644
--- a/language/types.xml
+++ b/language/types.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.179 $ -->
+<!-- $Revision: 1.180 $ -->
  <chapter id="language.types">
   <title>Types</title>
 
@@ -1082,7 +1082,15 @@ echo "I'd like to have another {${ strrev('reeb') }}, hips";
       
       <note>
        <para>
-        Functions and method calls works since PHP 5.
+        Functions and method calls work since PHP 5.
+       </para>
+      </note>
+      <note>
+       <para>
+        Parsing variables within strings uses more memory than string
+        concatenation. When writing a PHP script in which memory usage is a
+        concern, consider using the concatenation operator (.) rather than
+        variable parsing.
        </para>
       </note>
      </sect4>