Since version 0.53,
selectedIndex has been replaced with
selectedId.
diff --git a/docs/src/pages/components/MultiSelect.svx b/docs/src/pages/components/MultiSelect.svx
index 6af4b4dd..f88aa9ac 100644
--- a/docs/src/pages/components/MultiSelect.svx
+++ b/docs/src/pages/components/MultiSelect.svx
@@ -1,8 +1,14 @@
+`MultiSelect` is keyed for performance reasons.
+
+
+ Every items
object must have a unique "id" property.
+
+
### Default
By default, items will be ordered alphabetically based on the `item.text` value. To prevent this, see [#no-alphabetical-ordering](#no-alphabetical-ordering).