diff --git a/src/components/accordion/Accordion.d.ts b/src/components/accordion/Accordion.d.ts
index 02dbc71aa..e09738f86 100755
--- a/src/components/accordion/Accordion.d.ts
+++ b/src/components/accordion/Accordion.d.ts
@@ -2,6 +2,7 @@ import Vue, { VNode } from 'vue';
 
 declare class Accordion extends Vue {
     multiple?: boolean;
+    activeIndex?: Number|[Number];
     $emit(eventName: 'tab-open', e: {originalEvent: Event, tab: any}): this;
     $emit(eventName: 'tab-close', e: {originalEvent: Event, tab: any}): this;
     $slots: {