diff --git a/reference/reflection/reflectionclass/isinstance.xml b/reference/reflection/reflectionclass/isinstance.xml
index c477a1c813..b6af1b3895 100644
--- a/reference/reflection/reflectionclass/isinstance.xml
+++ b/reference/reflection/reflectionclass/isinstance.xml
@@ -11,10 +11,10 @@
   &reftitle.description;
   <methodsynopsis>
    <modifier>public</modifier> <type>bool</type><methodname>ReflectionClass::isInstance</methodname>
-   <methodparam><type>string</type><parameter>object</parameter></methodparam>
+   <methodparam><type>object</type><parameter>object</parameter></methodparam>
   </methodsynopsis>
   <para>
-   Checks if a class is an instance of an object.
+   Checks if an object is an instance of a class.
   </para>
  </refsect1>