diff --git a/reference/classobj/functions/get-class-methods.xml b/reference/classobj/functions/get-class-methods.xml
index 141a5e4061..3c70e2f7ae 100644
--- a/reference/classobj/functions/get-class-methods.xml
+++ b/reference/classobj/functions/get-class-methods.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.10 $ -->
+<!-- $Revision: 1.11 $ -->
 <!-- splitted from ./en/functions/classobj.xml, last change in rev 1.2 -->
   <refentry id="function.get-class-methods">
    <refnamediv>
@@ -15,6 +15,7 @@
     <para>
      This function returns an array of method names defined for the
      class specified by <parameter>class_name</parameter>.
+     In case of an error, it returns &null;
     </para>
     <note>
      <para>
diff --git a/reference/classobj/functions/property-exists.xml b/reference/classobj/functions/property-exists.xml
index d25e821296..c8984931f9 100755
--- a/reference/classobj/functions/property-exists.xml
+++ b/reference/classobj/functions/property-exists.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <refentry id="function.property-exists">
  <refnamediv>
   <refname>property_exists</refname>
@@ -54,7 +54,8 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Returns &true; if the property exists or &false; otherwise.
+   Returns &true; if the property exists, &false; if it doesn't exist or
+   &null; in case of an error.
   </para>
  </refsect1>
 
diff --git a/reference/errorfunc/functions/set-error-handler.xml b/reference/errorfunc/functions/set-error-handler.xml
index ad5cc61f1f..16ef16882e 100644
--- a/reference/errorfunc/functions/set-error-handler.xml
+++ b/reference/errorfunc/functions/set-error-handler.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.30 $ -->
+<!-- $Revision: 1.31 $ -->
 <!-- splitted from ./en/functions/errorfunc.xml, last change in rev 1.1 -->
 <refentry id="function.set-error-handler">
  <refnamediv>
@@ -157,7 +157,7 @@
   &reftitle.returnvalues;
   <para>
    Returns a string containing the previously defined
-   error handler (if any), or &false; on error. If the previous handler
+   error handler (if any), or &null; on error. If the previous handler
    was a class method, this function will return an indexed array with
    the class and the method name.
   </para>
diff --git a/reference/errorfunc/functions/set-exception-handler.xml b/reference/errorfunc/functions/set-exception-handler.xml
index 0ca8a3a510..c94350ab78 100644
--- a/reference/errorfunc/functions/set-exception-handler.xml
+++ b/reference/errorfunc/functions/set-exception-handler.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.7 $ -->
+<!-- $Revision: 1.8 $ -->
 <refentry id="function.set-exception-handler">
  <refnamediv>
   <refname>set_exception_handler</refname>
@@ -42,8 +42,8 @@
  <refsect1>
   &reftitle.returnvalues;
   <para>
-   Returns the name of the previously defined exception handler, or &false; on error. If
-   no previous handler was defined, an empty string is returned.
+   Returns the name of the previously defined exception handler, or &null; on error. If
+   no previous handler was defined, &null; is also returned.
   </para>
  </refsect1>
  <refsect1>