diff --git a/reference/reflection/reflectionclass/implementsinterface.xml b/reference/reflection/reflectionclass/implementsinterface.xml
index 8024ddb835..1392140df5 100644
--- a/reference/reflection/reflectionclass/implementsinterface.xml
+++ b/reference/reflection/reflectionclass/implementsinterface.xml
@@ -46,6 +46,7 @@
   <para>
    <simplelist>
     <member><methodname>ReflectionClass::isInterface</methodname></member>
+    <member><methodname>ReflectionClass::isSubclassOf</methodname></member>
     <member><function>interface_exists</function></member>
     <member><link linkend="language.oop5.interfaces">Object Interfaces</link></member>
    </simplelist>
diff --git a/reference/reflection/reflectionclass/issubclassof.xml b/reference/reflection/reflectionclass/issubclassof.xml
index 5337611877..642dc08a47 100644
--- a/reference/reflection/reflectionclass/issubclassof.xml
+++ b/reference/reflection/reflectionclass/issubclassof.xml
@@ -14,7 +14,8 @@
    <methodparam><type>string</type><parameter>class</parameter></methodparam>
   </methodsynopsis>
   <para>
-   Checks if the class is a subclass of a specified class.
+   Checks if the class is a subclass of a specified class or implements
+   a specified interface.
   </para>
  </refsect1>
 
@@ -46,6 +47,7 @@
   <para>
    <simplelist>
     <member><methodname>ReflectionClass::isInterface</methodname></member>
+    <member><methodname>ReflectionClass::implementsInterface</methodname></member>
     <member><function>is_subclass_of</function></member>
     <member><function>get_parent_class</function></member>
    </simplelist>