diff --git a/mandango/reference-mapping.rst b/mandango/reference-mapping.rst
index 32bf17c..7937ae0 100644
--- a/mandango/reference-mapping.rst
+++ b/mandango/reference-mapping.rst
@@ -33,6 +33,9 @@ References One
 .. note::
   You must indicate the full class.
 
+.. note::
+  When adding a Reference One, you can specify that deletes on the parent object should "cascade", so that child objects are also deleted.  For this, use 'onDelete' => 'cascade'.
+
 References Many
 ---------------