diff --git a/api-ref/src/wadls/orchestration-api/src/v1/orchestration-api.wadl b/api-ref/src/wadls/orchestration-api/src/v1/orchestration-api.wadl
index 0ca04142a..ca764be3e 100644
--- a/api-ref/src/wadls/orchestration-api/src/v1/orchestration-api.wadl
+++ b/api-ref/src/wadls/orchestration-api/src/v1/orchestration-api.wadl
@@ -814,6 +814,19 @@
             title="List resources">
             <para role="shortdesc">Lists resources in a stack.</para>
         </wadl:doc>
+        <request>
+            <representation mediaType="application/xml">
+                <param name="nested_depth" style="query" required="false">
+                    <wadl:doc xmlns="http://docbook.org/ns/docbook"
+                        xml:lang="EN">
+                        <para>
+                            Also includes resources from nested stacks up to
+                            <code>nested_depth</code> levels of recursion.
+                        </para>
+                    </wadl:doc>
+                </param>
+            </representation>
+        </request>
         <response status="200"/>
     </method>
     <method name="GET" id="resource_show">