diff --git a/reference/array/functions/array-walk-recursive.xml b/reference/array/functions/array-walk-recursive.xml
index 79f4c68e633f..530360b17ffe 100644
--- a/reference/array/functions/array-walk-recursive.xml
+++ b/reference/array/functions/array-walk-recursive.xml
@@ -18,6 +18,11 @@
    element of the <parameter>array</parameter>. This function will recurse
    into deeper arrays.
   </para>
+  <para>
+   Passing an object as the <parameter>array</parameter> is allowed, and will be treated as if it had been
+   <link linkend="language.types.array.casting">cast</link> to an array first. Regardless of whether the
+   function started with an array or an object, it will not recurse into inner objects.
+  </para>
  </refsect1>
  <refsect1 role="parameters">
   &reftitle.parameters;