diff --git a/language/oop5/overloading.xml b/language/oop5/overloading.xml
index fd46f693d7..53c984491d 100644
--- a/language/oop5/overloading.xml
+++ b/language/oop5/overloading.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.15 $ -->
+<!-- $Revision: 1.16 $ -->
  <sect1 id="language.oop5.overloading">
   <title>Overloading</title>
 
@@ -17,6 +17,7 @@
    Since PHP 5.1.0 it is also possible to overload the
    <function>isset</function> and <function>unset</function> functions via the
    __isset and __unset methods respectively.
+   Method __isset is called also with <function>empy</function>.
   </para>
 
   <sect2 id="language.oop5.overloading.members">