diff --git a/reference/classobj/functions/get-declared-interfaces.xml b/reference/classobj/functions/get-declared-interfaces.xml
index 9992faf707..a3961d6fa7 100644
--- a/reference/classobj/functions/get-declared-interfaces.xml
+++ b/reference/classobj/functions/get-declared-interfaces.xml
@@ -56,6 +56,7 @@ Array
   &reftitle.seealso;
   <para>
    <simplelist>
+    <member><function>interface_exists</function></member>
     <member><function>get_declared_classes</function></member>
     <member><function>class_implements</function></member>
    </simplelist>
diff --git a/reference/classobj/functions/interface-exists.xml b/reference/classobj/functions/interface-exists.xml
index 163eec9559..7251a7db24 100644
--- a/reference/classobj/functions/interface-exists.xml
+++ b/reference/classobj/functions/interface-exists.xml
@@ -72,6 +72,8 @@ if (interface_exists('MyInterface')) {
   &reftitle.seealso;
   <para>
    <simplelist>
+    <member><function>get_declared_interfaces</function></member>
+    <member><function>class_implements</function></member>
     <member><function>class_exists</function></member>
    </simplelist>
   </para>