diff --git a/index.bs b/index.bs
index 88bbfeb..2f4ff32 100644
--- a/index.bs
+++ b/index.bs
@@ -4301,10 +4301,30 @@ interface IDBRecord {
 
 The <dfn attribute for=IDBRecord>key</dfn> getter steps are to return the result of [=/converting a key to a value=] with [=/this=]'s [=record snapshot/key=].
 
+NOTE:
+If {{IDBRecord/key}} returns an object (e.g. a {{Date}} or {{Array}}), it
+returns the same object instance every time it is inspected. This means that if
+the object is modified, those modifications will be seen by anyone inspecting
+the value of the record. However modifying such an object does not modify the
+contents of the database.
+
 The <dfn attribute for=IDBRecord>primaryKey</dfn> getter steps are to return the result of [=/converting a key to a value=] with [=/this=]'s [=record snapshot/primary key=].
 
+NOTE:
+If {{IDBRecord/primaryKey}} returns an object (e.g. a {{Date}} or {{Array}}),
+it returns the same object instance every time it is inspected. This means that
+if the object is modified, those modifications will be seen by anyone
+inspecting the value of the record. However modifying such an object does not
+modify the contents of the database.
+
 The <dfn attribute for=IDBRecord>value</dfn> getter steps are to return [=/this=]'s [=record snapshot/value=].
 
+NOTE:
+If {{IDBRecord/value}} returns an object (e.g. a {{Date}} or {{Array}}), it
+returns the same object instance every time it is inspected. This means that if
+the object is modified, those modifications will be seen by anyone inspecting
+the value of the record. However modifying such an object does not modify the
+contents of the database.
 
 <!-- ============================================================ -->
 ## The {{IDBCursor}} interface ## {#cursor-interface}