diff --git a/reference/var/functions/is-object.xml b/reference/var/functions/is-object.xml
index b7bfdcefb1..3307250d8e 100644
--- a/reference/var/functions/is-object.xml
+++ b/reference/var/functions/is-object.xml
@@ -104,8 +104,11 @@ var_dump(get_students($obj));;
   &reftitle.seealso;
   <para>
    <simplelist>
+    <member><function>isset</function></member>
+    <member><function>is_null</function></member>
     <member><function>is_bool</function></member>
     <member><function>is_int</function></member>
+    <member><function>is_numeric</function></member>
     <member><function>is_float</function></member>
     <member><function>is_string</function></member>
     <member><function>is_array</function></member>